Actually vomited earlier because it made me vomit, that actually the head thing is horrible; It was out of my sleep, cant sleep; Getting worried; It is really weird; Am laying in the black room because light is hurting my head so bad; Most terrific headache and each day, its getting worse and worse, and getting very, and my head, the pain is unbelievable; left arm blew up, its looks like a baseball and it's got hard, whole arm got all, It was so swollen for 4 days; Got the Pfizer shot and got sick for 3 or 4 days; This is a spontaneous report from a contactable consumer (the patient). A 49-years-old female patient received first dose of bnt162b2 (BNT162B2, Formulation: Solution for injection, Batch/Lot Number: ER8734; Expiration Date: 31Jul2021) via an unspecified route of administration, in left arm on 19Jun2021 13:30 (at the age of 49-years-old) as a single dose for COVID-19 immunisation; oxycodone hydrochloride, paracetamol (PERCOCET), route of administration, start and stop date, batch/lot number and dose were not reported for back disorder; paracetamol (TYLENOL), route of administration, start and stop date, batch/lot number and dose were not reported for headache; oxycodone, route of administration, start and stop date, batch/lot number and dose were not reported for back disorder, intervertebral disc protrusion. Medical history included back problems, severe spinal stenosis, Osteoarthritis, MALS (Median arcuate ligament syndrome, It was vascular problem under stomach, it's very rare and should undergo another surgery for that), severe back pain, herniated disc (11 herniated disc and the back operation), endometriosis (had 8 endometriosis surgery. Had been on oxycodone because had severe endometriosis), complement deficiency disease (it is a rare autoimmune disease), sickly, all from an unknown date and unknown if ongoing. On an unspecified underwent hysterectomy (had 8 pelvic surgeries including a hysterectomy and gained ton of weight). The patient's concomitant medications were not reported. The patient did not receive any other vaccines within 4 weeks prior to the COVID vaccine. On an unspecified date in Jun2021, the patient experienced most terrific headache and each day, its getting worse and worse, and getting very, and my head, the pain is unbelievable, left arm blew up, its looks like a baseball and it's got hard, whole arm got all, It was so swollen for 4 days, got the Pfizer shot and got sick for 3 or 4 days. On an unspecified date, the patient stated that actually vomited earlier because it made me vomit, that actually the head thing is horrible, it was out of my sleep, cant sleep, getting worried; it is really weird, am laying in the black room because light is hurting my head so bad. It was reported that the patient had the first Pfizer shot 8 days ago and now experiencing the most terrific headache started two days after getting the Pfizer shot and each day it was getting worse and head pain is unbelievable and now it was so uncontrollable. The patient stated that it's been a whole week and headache was getting worse. The patient stated that she was taking Tylenol and Percocet because of a bad back and my husband put ice all around my head and my temporal. The patient reported that she can't, it that plead, it hurt so bad and it felt like so much pain all over around her head. The patient stated she don't normally take Tylenol because it could cause liver problems but taking it after the shot a little bit after the headache and it was hardly controlling it. Consumer stated she has been taking oxycodone for 10 years because of back disease and 11 herniated disc, that not causing the headache, that's not something new, and never had headache like this in my life, it was out of my sleep, can't sleep, it was horrible. It was like somebody at both sides of my head like and they have like rice strips in there crushing it. The patient stated that as a treatment she tried Tylenol and Motrin the other day. Consumer stated, left arm blew up its looks like a baseball and it was got hard, my whole arm got all it was so swollen for 4 days and now it was okay, it went down. Consumer further stated that she was laying in the black room because light is hurting her head so bad. Consumer stated still experiencing event: When she got the shot and got sick for 3 or 4 days. Had a terrible headache and then she started feeling better. Now, on day 6th, 7th and 8th day after the first Pfizer shot, the headache came back and it is worse. The patient was supposed to go get her second shot in about 2 weeks but the pharmacist told her to come 2 or 3 weeks later i.e. on 17Jul2021 as she could go to 4 weeks because she had auto-immune diseases, already with problem and so worried about getting the shot. The patient was worried and wanted to talk to someone at Pfizer to find what should be done or it was normal, or should go to the hospital. The action taken in response to the events for Percocet, Tylenol and oxycodone was unknown. Therapeutic measures were taken as a result of most terrific headache and each day, its getting worse and worse, and getting very, and my head, the pain is unbelievable. The outcome of events "most terrific headache and each day, its getting worse and worse, and getting very, and my head, the pain is unbelievable" and "Got the Pfizer shot and got sick for 3 or 4 days" was not recovered, outcome for "Left arm blew up, its looks like a baseball and it's got hard, my whole arm got all, It was so swollen for 4 days" was recovered on an unspecified date in Jun2021 and outcome for rest all events was unknown.  Information on Lot/Batch number was available. Additional information has been requested