The arm where I got the injection, it is starting to itch in the muscle; trouble sleeping; like having a hangover; her arm hurt in the muscle where [they] gave [her] the shot for 3 days; feeling groggy; leg pain; Headache; don't feel like normal; Charley horses/leg cramps; couldn't think straight; a headache "that felt like i was drunk"; troubled sleep; loose bowel movement; the index fingers of both my hands were swollen a little bit stiff.; the index fingers of both my hands were swollen a little bit stiff.; This is a spontaneous report from a contactable consumer or other non hcp. A 81-year-old female patient received bnt162b2 (BNT162B2 Formulation: Solution for injection), dose 1 via an unspecified route of administration, administered in Arm on 19Feb2021 15:15 (Batch/Lot Number: EN6198) as DOSE 1, SINGLE for covid-19 immunisation. Medical history included ongoing hypertension, allergy, 3 broken bones, the sacrum, the pelvic and the tail from an unknown date and unknown if ongoing. Concomitant medication(s) included nebivolol hydrochloride (BYSTOLIC) taken for hypertension, start and stop date were not reported; acetylsalicylic acid (BABY ASPIRIN) taken for an unspecified indication, start and stop date were not reported. Patient received first dose on Friday. Four hours later she had headache for 3 days, she felt like she couldn't think straight, gorging and "like having a hangover". On Friday night she had terrible leg cramps that lasted for a couple hours. Her am is still sore and itching(She lastly explained her arm hurt in the muscle where [they] gave [her] the shot for 3 days, then it itched). patient stated, "I have a lot of allergies. I sat in the waiting area for a half an hour. I got home and about 8 o'clock at night, I start getting a headache so. I took a Tylenol, it didn't help, (PC Filed) I took another one and it somewhat helped. I went to bed, I had a very troubled sleep and I woke up with terrible pains in my right leg like a Charley horse, I had them before if I don't drink enough water. I got up, I took some water, went back to bed, by 2 hours later the pain happened again so I took some more water went back to bed, by 2 hours later got the pain in my left leg and I got up and I took a little milk. I tried to stand, it was very difficult. I had, it feels still since Friday like I am drunk. If you say is it a headache, not exactly but I don't feel like normal. On Saturday night I took 2 Dulcolax which are laxatives because I didn't go, have a bowel movement for couple of days and when I always take Tylenol I get constipated, so I took it so yesterday afternoon I was tired laid down in the afternoon and I had panty liners thinking that if I have a loose bowel movement or whatever, it was all like diarrhea a little more consistency all the way up to the slacks belt of my slacks, I had to clean myself up of course and then I was very very careful if I pass gas so I wouldn't be passing stool. This morning I went to the washroom and I still had a loose bowel movement but it wasn't diarrhea. My head still feels like I have been all drinking and I never drink, I am 81. The arm where I got the injection, it is starting to itch in the muscle and this morning I don't know if this is just arthritis or my age, the index fingers of both my hands were swollen a little bit and stiff. Whether that is from the Covid, I don't know but I don't feel right.", also reported that felt kind of groggy like if almost being drunk. The patient reported "I do have hypertension but last time I went to the doctor couple of weeks ago, it was 144 over 70 and he said fine. I was in a skilled nursing facility 9 days and my blood pressure was always 123 over 70." also reported that probably 3 weeks her blood Creatinine were a little elevated but other than that nothing. Also reported , "I would give them a call because you see the diarrhea could have been due to the Dulcolax, the laxative and then I had fiber or it could have been that it was just diarrhea because of the shot, I don't believe that. The muscle pain, leg pain, the cramps in the leg that is muscle pain I believe I had that, I did walk a great distance to get to the location, it could have been that maybe I didn't drink enough water, it could be relative things but the underlying headache, it's still I feel groggy it feels like I am almost, I had too much to drink." The patient underwent lab tests and procedures which included blood pressure measurement: 144 over 70, 123 over 70. Therapeutic measures were taken as a result of charley horses/leg cramps, headache, leg pain. The outcome of the event charley horses/leg cramps and headache was recovered and for other events it was unknown.  No follow-up attempts are needed. No further information is expected.