Blood clots in Lungs; No longer able to do activities of daily living; Almost fell to floor from sitting position; short of breath; total body exhaustion/fatigue; sleepy throughout the day; unstable, weak; debilitating symptoms bedridden/unstable, weak; debilitating symptoms bedridden; passed out completely while sitting; Unable to complete daily 1 mile walk at park/Unable to take stairs; Lightheaded/dizzy; This is a spontaneous report from a contactable consumer.  A 78-years-old female patient received bnt162b2 (BNT162B2), dose 1 via an unspecified route of administration, administered in Arm Right on 26Mar2021 15:00 (Batch/Lot number was not reported) as SINGLE DOSE for covid-19 immunisation.  Medical history included patient had COVID-19 Dec2021 and recovered completely in 2 weeks. Symptoms: fever, sleepy. Went back to daily walk after 2 weeks. No loss of smell, no loss of taste, no mental changes- was very happy with my complete recovery. Took vaccine 26Mar2021 at recommendation of doctor to be safe from variants. Regret deeply, still hospitalized as of this writing. Concomitant medications included ramipril; rosuvastatin calcium 40mg; levothyroxine, all taken for an unspecified indication, start and stop date were not reported.  The patient previously took sulphur and experienced allergies. The patient experienced unable to complete daily 1 mile walk at park/unable to take stairs on 27Mar2021, lightheaded/dizzy on 27Mar2021, passed out completely while sitting on 28Mar2021, unstable, weak on 30Mar2021, short of breath on 31Mar2021, total body exhaustion/fatigue on 31Mar2021, sleepy throughout the day on 31Mar2021, almost fell to floor from sitting position on 09Apr2021, debilitating symptoms bedridden/unstable, weak on 26Mar2021, debilitating symptoms bedridden on 26Mar2021, no longer able to do activities of daily living on 13Apr2021, blood clots in lungs on 14Apr2021, all with outcome of not recovered.  Reported adverse event: 27Mar2021 - Unable to complete daily 1 mile walk at park. Lightheaded, dizzy 28Mar2021 Dizzy, passed out completely while sitting. Revived and taken to hospital by ambulance 28Mar2021 Admitted to (hospital name withheld) 30Mar2021 Discharge from hospital - unstable, weak 31Mar- 08Apr2021 - short of breath easily. Unable to take stairs. Discontinued daily walk, weak, total body exhaustion, sleepy throughout the day 09Apr2021 - Almost fell to floor from sitting position. Patient's daughter lowered patient gently to the floor. Revived shortly 13Apr2021 Saw primary doctor Dr (name withheld). Shared her debilitating symptoms bedridden since Covid-19 vaccine on 26Mar. BP taken from lying down, sitting and standing was markedly different and explained caused passing out and lightheaded. No longer able to do activities of daily living 14Apr2021 - Exhaustion and fatigue, her daughter to her back to the hospital 14Apr2021 - Passed out in Emergency Room @ (hospital name withheld). Admitted. Blood clots in LUNGS. The events resulted in: Doctor or other healthcare professional office/clinic visit, Emergency room/department or urgent care, Hospitalization, Life threatening illness (immediate risk of death from the event), Disability or permanent damage. The patient was hospitalized for unable to complete daily 1 mile walk at park/unable to take stairs, lightheaded/dizzy, passed out completely while sitting, all from 28Mar2021 to 30Mar2021.  The patient underwent lab tests which included blood pressure measurement: markedly different on unknown date. Patient was not pregnant. No other vaccine in four weeks.Patient had covid prior vaccination. No covid tested post vaccination. The treatment received for events included Heparin administered, still hospitalized as of now.   Information about Lot/ Batch number has been requested.