Fever; Chills; Headache; Shaking uncontrollably; she did not feel good; Blood pressure elevated; Got the Covid Booster on 25Oct2021; feels so sick; She feels so achy and like she feels like has been beaten up; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 75 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 25Oct2021 15:00 (Batch/Lot number: unknown) at the age of 75 years as dose 3 (booster), single for covid-19 immunisation. The patient had no relevant medical history. The patient took concomitant medications. Vaccination history included: Bnt162b2 (first dose), administration date: 19Mar2021, when the patient was 75 years old, for Covid-19 immunization, reaction(s): "Headache"; Bnt162b2 (second dose), when the patient was 75 years old, for Covid-19 immunization, reaction(s): "headache"; Bnt162b2 (second dose), for Covid-19 immunization, reaction(s): "2nd dose: Got it the specified number of days later, probably like 90 days later". The following information was reported: IMMUNISATION (non-serious) with onset 25Oct2021, outcome "unknown", described as "Got the Covid Booster on 25Oct2021"; BLOOD PRESSURE INCREASED (non-serious) with onset 25Oct2021 15:20, outcome "unknown", described as "Blood pressure elevated"; PYREXIA (non-serious) with onset 25Oct2021 21:00, outcome "recovering", described as "Fever"; CHILLS (non-serious) with onset 25Oct2021 21:00, outcome "recovering", described as "Chills"; HEADACHE (non-serious) with onset 25Oct2021 21:00, outcome "not recovered", described as "Headache"; TREMOR (non-serious) with onset 25Oct2021 21:00, outcome "recovering", described as "Shaking uncontrollably"; MALAISE (non-serious) with onset 25Oct2021 15:20, outcome "unknown", described as "she did not feel good"; MALAISE (non-serious) with onset Oct2021, outcome "unknown", described as "feels so sick"; PAIN (non-serious) with onset Oct2021, outcome "unknown", described as "She feels so achy and like she feels like has been beaten up". Relevant laboratory tests and procedures are available in the appropriate section.  Additional Information: The patient's age at onset was reported as 75 and three quarters. The patent reported to be in perfect health. The patient reported that she did not take anything serious as concomitant medications, reported to take a few medications, but did not take any cancer drugs or immune suppressants. The patient received COVID vaccine as medical center. No additional vaccines administered on same date of the Pfizer suspect. The patient did not receive prior vaccinations (within 4 weeks). It was reported that the patient had both covid vaccines. She mentioned she had some reactions, but nothing to write home about. Got the Covid Booster on 25Oct2021. All events started 25 Oct 2021. Something in blood stream was reeving up. It felt like she drank 18 coffees and was wound up. Then 20 mins into it she just felt strange. However, she had to wait 30 minutes after getting the booster. It was 20 minutes after receiving it she did not feel good. She felt like something was strange. Normally, she has low blood pressure, but while there it was elevated, but not dangerously high. By 9pm she went to bed had fever, shaking inside uncontrollably (she was dressed in 3 layers of fleece at the time of reporting, but it was getting better), horrible headache; horrible, horrible headaches it was worse than anything than experienced with the other two covid vaccines. The headache this time was horrible, it was a pounding headache. This was still going on and she had chills. She reiterated the headache was severe. Got the Covid Booster on 25Oct2021. All events started 25 Oct 2021. Something in blood stream was reeving up. It felt like she drank 18 coffees and was wound up. Then 20 mins into it she just felt strange. The patient confirmed that fever and chills were not as bad as was, it was better. Last night she could not go downstairs for Tylenol, water or anything. The patient reported to be live alone with no one to help. The patient reported that she "feels so sick" and cannot get up. She "feels so achy and like she feels like has been beaten up". The event did not result in emergency room visit or physician office visit. The patient stated she was so sick. She could not have gone anywhere if she wanted to. She was lucky she was sitting upright now. Relevant tests were reported as none. It was conveyed to patient that medications tend to effect people over 75 more, maybe the gerontologic population effects were more severe. She added, she will never get the covid vaccine after again. She will never want to go through all this suffering again.  No follow-up attempts have been completed; information about lot/batch number cannot be obtained. No further information is expected.