abdominal pain on my lower left side; severe nausea; Extreme Exhaustation/tiredness; Dehydration; elevated liver enzymes; she couldn't' stay awake to save her life and even fell asleep in the ER.; feeling ill; This is a spontaneous report received from a contactable consumer (patient). A 58-year-old female patient received first dose of bnt162b2 (BNT162B2, PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Lot number: EL3248, Expiration date was not reported), via an unspecified route of administration, administered in left arm on 27Jan2021 12:30 as single dose for covid-19 immunisation. The patient medical history and concomitant medications were not reported. History of all previous immunization with the Pfizer vaccine considered as suspect. Prior Vaccinations (within 4 weeks) reported as none. Family medical history Relevant to AE(s) reported as none. Additional vaccines administered on Same Date of the Pfizer Suspect reported as none. Patient reported that by Friday she was sort of feeling ill, with nausea and extreme tiredness Reporting that patient was so tired she couldn't even get up. By the beginning of that week patient developed abdominal pain on her lower left side on 01Feb2021, pain that patient never felt before. On the next Friday patients husband took her to the ER. We were there for several hours they said patient was dehydrated did blood tests, tested me for covid which was negative, and patient was sent home with no idea what this was, but was told that this was likely vaccine related and to wait it out. patient reports that the ER doctor told her that they had several other people with similar symptoms and the only connection is they had the vaccine. patient reports that 3 weeks later she was scheduled for her second dose, but she missed it because she went back to the ER again with severe pain. This time they said maybe its a kidney stone. So they did a CT scan gave her fluids and everything was normal except patient had elevated liver enzymes which they again said was probably related to the vaccine. Patient reports that she didn't start feeling better until 5 weeks later. Patient reports that she has seen her HCP who agreed with the ER doctors that this was likely vaccine related but had no additional guidance to provide. Patient experienced on Extreme Exhaustation on 29 Jan 2021.Patient States she had her first vaccine on 27Jan2021. States about 3 days after she started getting really ill. Caller states she thought it was something non related and she ended up in the ER two different times, states it should have been 3, but she knew they couldn't do anything about it. Caller states that she was severely ill and they couldn't find anything, the ER said that it was from the vaccine. States that this went on for 5 weeks. States that she is finally better but now she has missed the second vaccine. She states the second time she went in to the ER, she was supposed to get her second vaccine but they told her to wait and now she is past the time to get the second vaccine. She states that she doesn't know whether or not it was the vaccine [that caused her illness] so she doesn't know what to do [about the second vaccine]. Asking what is recommended. Patient States that she was extremely tired, more tired than she has ever been in her life. States that she thought she might have gotten Covid, but they did a blood test and she had no antibodies, so no Covid then or prior. States that she could not stay awake to save her life and even fell asleep in the ER. Clarifies that she got the vaccine on a Wednesday and by Friday it kicked in and by Sunday, she recalls that she couldn't stay awake and normally she has lots of energy and has insomnia. States she was sleeping twenty hours a day and trying to work. States that she has some energy back and sleeps good, has no problem going to bed at night. States it has improved but not completely recovered. patient had Severe abdominal pain lower left side on 1Feb2021. Patient had severe nausea on 29Jan2021 states that she couldn't eat or drink, nothing sounded good at all. States she related the nausea to the pain because of her severe pain. Patient had dehydration and states she got 4 bags of fluid because she was dehydrated, unknown specific dates. Patient States the worst part was the pain and nothing would help it, she couldn't get under control. patient states that she never goes to the ER but her husband took her the following Wednesday, so 10 days later, to the ER. Patient States she had 2 bags of fluid and a ton of blood work and antibody test and found nothing. States she was back in the ER the following Wednesday and the pain had gotten worse and they did a CT and thought it was kidney stones but they said they can't connect it to anything other than the Covid vaccine. She states the ER said they had been seeing a lot of that. Patient states she is leery about the second vaccine if it is going to be the same reaction, it was horrible, like if it would trigger. Patient States the ER was adamant on what it was. States she thought it was better to report it than not and she didn't have the second one 3 weeks later. Patient states she doesn't know about that, she knows 6 weeks period. States been reading thing that state she cant get it after 6 weeks. States some people say she should still get it and others tell her not to. Patient report adverse event from Covid vaccine. States she thinks they put Zofran in the fluid. Zofran didn't really help. As per the reporter seriousness criteria reported as medically significant for the event of dehydration. Therapeutic measures were taken as a result of tiredness, abdominal pain on my lower left side, elevated liver enzymes, feeling ill, severe nausea, extreme exhaustation, dehydration. The outcome of the event abdominal pain lower, severe nausea was resolved on 07Mar2021, Extreme Exhaustation/tiredness was resolving and unknown for other events.  Follow up attempts are needed. Further information has been requested.