severe muscle aches and pains; nausea; headache; brain fog including loss of cognition; brain fog including loss of cognition; extreme fatigue; slept most of the time; 3 days after receiving 2nd dose of the Pfizer vaccine, I started experiencing severe muscle aches and pains, nausea, headache, brain fog including loss of cognition and extreme fatigue.  I slept most; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 73 year-old female patient (not pregnant) received bnt162b2 (BNT162B2), administered in arm right, administration date 12Mar2021 09:15 (Lot number: EN6204) at the age of 73 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "High blood pressure" (unspecified if ongoing), notes: High blood pressure; "General Anxiety Disorder" (unspecified if ongoing), notes: General Anxiety Disorder; "Osteoarthritis" (unspecified if ongoing); "COVID symptom", start date: Jul2020 (unspecified if ongoing), notes: COVID symptom for 6 weeks in July 2020, but tested negative, both for the virus and antibodies. Concomitant medication(s) included: CELEXA [CELECOXIB]; LOSARTAN; TRAZODONE; DICLOFENAC. Vaccination history included: Bnt162b2 (product=COVID 19, lot no EL9267, administration date18Feb21, at 10:00 AM, dose 1,vaccine location=Right arm), administration date: 18Feb2021, when the patient was 73 years old, for COVID-19 IMMUNISATION. The following information was reported: MYALGIA (non-serious) with onset 15Mar2021, outcome "not recovered", described as "severe muscle aches and pains"; NAUSEA (non-serious) with onset 15Mar2021, outcome "recovered" (2021), described as "nausea"; HEADACHE (non-serious) with onset 15Mar2021, outcome "recovered" (2021), described as "headache"; FEELING ABNORMAL (non-serious), COGNITIVE DISORDER (non-serious) all with onset 15Mar2021, outcome "not recovered" and all described as "brain fog including loss of cognition"; FATIGUE (non-serious) with onset 15Mar2021, outcome "not recovered", described as "extreme fatigue"; HYPERSOMNIA (non-serious) with onset 15Mar2021, outcome "not recovered", described as "slept most of the time"; BLOOD IMMUNOGLOBULIN G DECREASED (non-serious) with onset 2021, outcome "not recovered", described as "3 days after receiving 2nd dose of the Pfizer vaccine, I started experiencing severe muscle aches and pains, nausea, headache, brain fog including loss of cognition and extreme fatigue.  I slept most". The events "severe muscle aches and pains", "nausea", "headache", "brain fog including loss of cognition", "brain fog including loss of cognition", "extreme fatigue", "slept most of the time" and "3 days after receiving 2nd dose of the pfizer vaccine, i started experiencing severe muscle aches and pains, nausea, headache, brain fog including loss of cognition and extreme fatigue.  i slept most" were evaluated at the physician office visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were not taken as a result of myalgia, nausea, headache, feeling abnormal, cognitive disorder, fatigue, hypersomnia, blood immunoglobulin g decreased.  Additional information: 3 days after receiving 2nd dose of the Pfizer vaccine, patient started experiencing severe muscle aches and pains, nausea, headache, brain fog including loss of cognition and extreme fatigue. she slept most of the time, unable to perform simple tasks or take care of personal business. 60 days after the shot, patient woke up feeling like she might survive. The headache and nausea went away. Another 45 days later she still very fatigued and experience brain fog and loss of cognition. Patient had blood work, a brain MRI (normal for my age) and infectious disease testing (no diagnosis revealed). Blood work did show that her IgG was low. Patient never been tested for that before so she don't know if that was something new or it had always been low. patient searched the internet and cannot find any articles about people experiencing Long haul symptoms without ever testing positive for COVID. Patient had COVID symptom for 6 weeks in Jul2020, but tested negative, both for the virus and antibodies. No Covid prior vaccination and did not tested for Covid post vaccination, not Known allergies,