went right back to sleep after her call and didn't wake up till next morning,; dull headache; head was swimming; blood pressure went to 220/blood pressure was really high; black spots across my face; swimmy headed; legs didn't feel like they would hold her up/felt like my legs weren't going to hold me up; weak; very fatigued; This is a spontaneous report from a contactable consumer (patient). A 78-years-old female patient received the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, lot number: ER8731), via an unspecified route of administration, administered in left arm on 15Apr2021 13:15 (at the age of 78-years-old) as a SINGLE DOSE for COVID-19 immunization. The patient's medical history and concomitant medications were not reported. She had her shot and just had a bad reaction to her very first shot. She came home, states sometimes she may doze off for 15 minutes or so but she fell asleep until at 16:00 she was woken up by a call from a friend. On 15Apr2021, she felt very fatigued and weak on Friday; later adds she was tired the day of shot as well. She laid around all day sleeping on Friday. On 17Apr2021 Saturday her legs didn't feel like they would hold her up and so she laid around again all day. On 18Apr2021 Sunday she knows had gotten up to go to bathroom a couple of times in the night; but then in the morning she was going to get up and felt faint; later adds she felt dizzy; states her head was swimming and she saw black spots and it scared her to death. Adds she thought she should go and sit up in the living room. But even after she sat down, sitting straight up, she kept seeing black spots. A friend took her to the emergency room (ER) for the dizziness and seeing spots. At the ER they found her blood pressure was really high; she thinks it was 220 over something, she forgot the bottom figure. They put an IV in to give her medication; did an electrocardiogram; a chest xray; blood work; a urinalysis and all of those tests everything was fine. The ER staff helped her to bathroom and her head was still swimming but they said that was because her blood pressure was still high. Adds her blood pressure went down on it's own and she had no medication for the blood pressure. They told her you are remarkable at your age to not to be on medication. She saw her doctor yesterday. Reports at the doctor's office her blood pressure was about 128/63. The doctor told her it was kind a low and that she basically runs low. She was not dizzy anymore on Sunday after her blood pressure went down. Adds she got a dull headache yesterday but she thinks it might of been a caffeine headache because she has had a caffeine headache in the past when she had to stop caffeine for a test or something. She has to take the second dose on 06May2021, and her doctor told her to take it; but she is scared to death. She asking for a recommendation as to whether she should get the second dose. The adverse event resulted the patient to visit emergency room and was not admitted and also visited to physician office. Outcome of the event hypertension was resolved on 18Apr2021, while for events- black spots across my face, dull headache, swimmy headed, feeling abnormal, head was swimming was resolved on 19Apr2021 and that for fatigue, weak was not recovered and sleep disorder was unknown.  No follow-up attempts are possible. No further information was expected.