I felt very tired and weak; I felt very tired and weak; my heart was skipping really bad I could hear it, could felt it in my chest. Then trembling; heart palpitations and it was skipping and trembling off and on; arm is sore; weird feeling; trembling; trembling, shaking and she thought she was going to have a seizure, she had no control over her muscles; muscles twitching, like if I had no control over the muscles; she had to use the bathroom a couple hours after the shot. She stated she has been drinking a lot; didn't feel good last night; This is a spontaneous report from a contactable consumer (patient). A 64-years-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), dose 1 via an unspecified route of administration, administered in Arm Right on 06Apr2021 13:00 (Batch/Lot Number: ER8737) as SINGLE DOSE for covid-19 immunisation, at 64 years old. Medical history included cholesterol (abnormal, takes cholesterol medication 3 times a week as she gets side effects from it), cutaneous lupus (She always has to do bloodwork and goes in every 3 months), heart problem that is not major (she takes 1 medication, patient stated once in a while she sees her cardiologist every 6 months and she did get a halter monitor for 24 hours for a week and they take an average and said it wasn't as bad and knows that is a problem), 2 cervical spine surgeries, arthritis, allergic to contrast dye for CAT scans, allergy to medications (sensitive to medications), shrunk a lot because of issues, and had surgery which shrunk her because of her spine from an unknown date. Concomitant medication included atorvastatin calcium (LIPITOR) taken for blood cholesterol abnormal from 2016 and ongoing; and nadolol (CORGARD) taken for an unspecified indication from 2001 and ongoing. Patient's son got COVID on an unspecified date. Patient previously took generic atorvastatin which made her sick on an unspecified date and LIPITOR and experienced muscle weakness on an unspecified date. No additional vaccines administered on the same date of the Pfizer vaccine. No prior vaccinations. Patient never got a flu shot as she was scared. On 06Apr2021, her arm was sore which is normal. Normal side effects from the arm did not concern her, patient had no fever nothing else.  She stated she came home and felt like she had to use the bathroom a couple hours after the shot. She stated she has been drinking a lot and she made sure of that. At 19:00 (also reported as 7-8pm), patient experienced her heart was skipping really bad. Patient could hear it and could felt it in her chest. Patient clarified her heart was not fast, it was more skipping, and she could feel it beating in her throat. She commented has a problem but that has not happened in a long time. Patient then experienced trembling described as lots of body trembling concerned like a seizure. She thought she was going to have a seizure. It was not chills; she had no fever or anything. The trembling came on and off. Her muscles were twitching, like if patient had no control over the muscles. Patient did not feel dizzy, it was a weird feeling. She did not feel good. On 07Apr2021 at 02:00, patient felt very tired and weak, her heart was better. About 02:00 she fell asleep. She woke up at 6:30 and she felt tired but that does not bother her. Her concern was the body trembling. She called her doctor but was not available. She was advised that it does not sound like a symptom of the vaccine. She was worried she needs to go to the cardiologist and see what is happening. She stated if it keeps happening, she will go, and she does not know if this is a side effect other people are reporting. Patient was wondering if this is a reaction as she cannot find it, one says a severe reaction is a fast heartbeat, really fast and skipping and she does not know. She expected anything, tired, headache, muscle aches but these did not happen, but she was expecting them to. Patient is wondering why her heart is doing that is it from the shot or what is going on with her which is weird, and stated the shaking, trembling of her whole body is weird. She mentioned she is sensitive to medication and gets reactions to a lot of medications. She stated this is why she was scared to get the vaccine and what the reaction was with the 1st. Patient stated her heart is a lot better than it was last night, that she feels very tired and feels unwell. She stated she took her temperature (Apr2021) and she had no fever, no nothing a little unwell, a weird feeling. Patient stated she is not trembling anymore and has no heart skipping, that went away about 2am when she fell asleep for a few hours (also reported as went away after about an hour, she had it off and on 3-4 times in an hour). Patient clarified she has not had testing done for the reported symptoms. The patient stated she is concerned and does not know what to do about second dose, which is scheduled for 04May2021. She does not if it was a reaction and stated she is very sensitive to medicine. Events did not require emergency room and physician office visit. Outcome of the event heart was skipping, tremor and palpitations was recovered on 07Apr2021 02:00 while unknown for the other events.  Follow-up attempts are completed. No further information is expected. Lot number has been obtained.