nervous; Back pain, butt and legs hurt, feels like Sciatica; Back pain, butt and legs hurt, feels like Sciatica; Back pain, butt and legs hurt, feels like Sciatica; Back pain, butt and legs hurt, feels like Sciatica; Constipated; Doesn't sleep through the night; Headache lasted for days and days; No appetite, lost 6 pounds in a week; No appetite, lost 6 pounds in a week; Tired; Diarrhea; Nausea; felt like Dumping Syndrome; Stiff neck, like an iron claw; Anxiety reared up; Blacked out; Soreness at injection site; This is a spontaneous report from a contactable consumer (patient). A 66-year-old female patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), via an unspecified route of administration in arm on 17Mar2021 at 11:30 AM (at the age of 66 years old) (Lot Number: EN6205, unknown expiration) as a single dose for COVID-19 immunisation.  Medical history included ongoing anxiety (40 years or more), ongoing depression (46 years ago, at the age of 20), ongoing acid reflux (maybe 25 years), ongoing GERD (maybe 25 years), ongoing Barrett's esophagus (for 12 years), mild to moderate COPD since 2011, gastric bypass (a year and a half ago), and lost 120 pounds. Concomitant medications included bupropion for anxiety depression and omeprazole for acid reflux, both ongoing.  The patient previously received flu and tetanus on unspecified dates for immunization and both experienced hard red welt on arm (welt was hard and lasted for 5-7 days). The patient reported no side effects for 12 hours, but a little soreness at injection site on 17Mar2021 at 20:00 (8:00 PM). Her arm wasn't heavy, but she had an awareness of the soreness.  She has had life-long anxiety and depression. Several weeks ago (on 26Mar2021), her anxiety reared up, and it could have been due to a family situation. On the 9th day after the first shot, she was having a therapy appointment on the phone and talking about her anxiety, and she got a stiff neck, like an iron claw (26Mar2021 at 10:00 am). It lasted for a couple of 5 minutes and she laid down on the couch then on the floor.  Her therapist said to call 911. Emergency medical technicians came to her house and they said all of her numbers looked good.  She went to the hospital, and was in the emergency room for several hours, but she only remembers one hour of it.  She also had diarrhea and nausea on 26Mar2021 at 11:30, and it felt like Dumping Syndrome, that one can have from a gastric bypass. She was only aware for one hour at that point and blacked out (on 26Mar2021). With regards to nausea, she mostly saw bile in the bag, all she had that day was a protein drink. She was back home and the next day, she did not remember how she got home. She hasn't had blackouts anymore but feels it may be from heightened anxiety.  On 27Mar2021 at 09:00, she had no appetite, lost 6 pounds in a week, and was tired. She had headache lasted for days and days on 29Mar2021 at 09:00 AM. She is slowly improving but she still doesn't sleep through the night on 29Mar2021 at 16:00. It was like a feeling like she was resetting her surgery, like she didn't care about eating.  The also experienced back pain, butt and legs hurt, feels like sciatica on 31Mar2021 at 16:00 and was constipated. She is using a stool softener and is back in her routine. She called her primary doctor and could not tell her what happened, and she went in a loop trying to get information and authorizations for her to make a determination of what had happened.  Her doctor felt like she should have an MRI. Her heart and all of her numbers looked good, as the emergency medical technicians said. Her primary doctor recommended her to get the second shot.  She had cancelled the second shot for this week, and she has rescheduled it for another date.  She was afraid that she will black out again, after the next vaccine, and is not sure if that is how her anxiety manifested. The main reasons she is calling is that she had no concerns of side effects prior to the vaccine, and a couple of her neighbors said they had read about side effects of the vaccine, but she was not worried.  When the patient started to read about side effects of the vaccine, she understood that on the 10th day, the vaccine starts to be in a person's system and that maybe is why she didn't have initial side effects, but then she had side effects several days later because the vaccine was in her body.  By day 10, the vaccine is in effect in the body and she is nervous. Her second vaccine is scheduled on 26Apr2021. The patient would like to know if there is any information on people that have had a gastric bypass. The patient has no prior vaccinations within 4 weeks. The events resulted in emergency room visit (except nervous). The patient recovered from soreness at injection site on 18Mar2021; recovered from diarrhea, nausea,  felt like Dumping Syndrome on 26Mar2021; recovered from stiff neck on 26Mar2021 at 10:05am; recovered from constipation on 02Apr2021; and recovered from no appetite and lost 6 pounds on unspecified dates. The patient also recovered from headache with sequelae on unspecified date; and recovered from blacked out on 27Mar2021 with sequelae. The patient had not yet recovered from anxiety reared up; tired; doesn't sleep through the night; back pain, butt and legs hurt, feels like sciatica.   No follow-up attempts are possible. No further information is expected.