her immune system since has not been the same and has been very deprived; her immune system since has not been the same and has been very deprived; wasn't feeling right; Dizzy; weak and very disoriented; weak and very disoriented; did not feel good; terrible headache and laid down right away; things started spinning/head spinning; Nauseous; Flu like symptoms; Flushed; very cold; chills; very cold; chills; Pain in arm; rapid heart beat; anxious; like something was going to happen; bathroom a couple times and felt week with the flu like symptoms, they were very bad; did eat something later yesterday, but food was flat tasting; didn't taste right; This is a spontaneous report from a contactable consumer (patient). A 78-year-old female patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Formulation: Solution for injection, Batch/Lot Number: EL9262, Expiration date: Unknown) via intramuscular route of administration in left arm on 28Jan2021 10:00 as SINGLE DOSE for COVID-19 immunization in the clinic. Medical history included neoplasm malignant, chemotherapy, radiotherapy, immune system disorder (her immune system since has not been the same and has been very deprived) from an unknown date and unknown if ongoing. Concomitant medications included bee venom for arthropod sting. The patient experienced wasn't feeling right , dizzy, weak and very disoriented, did not feel good, terrible headache and laid down right away, things started spinning/head spinning, nauseous, flu like symptoms, flushed, very cold, chills, pain in arm, rapid heart beat, anxious, like something was going to happen, bathroom a couple times and felt week with the flu like symptoms, they were very bad, did eat something later yesterday, but food was flat tasting, didn't taste right on 28Jan2021 and her immune system since has not been the same and has been very deprived on an unspecified date. the first Covid shot yesterday at 10:00. They had her to sit for 15 minutes to make sure she was okay to walk. About 7-8 minutes she noticed she wasn't feeling right, dizzy, weak and very disoriented. She got up and didn't want to create a scene and started walking through the clinic and stopped to ask the receptionist to call her husband in the car. There was so many people so she just kept walking and luckily was able to get to car and told her husband she did not feel good. By then she had a terrible headache and when she got home she laid down right away. Then things started spinning and she was very nauseous and is aware that these things can happen with the vaccine. Had flu like symptoms like she never had before, but this was worse. She did not have a fever, but was flushed and very cold, chills. Her arm was not hurting until about 9pm and during the night she had a rapid heart beat, but not really. Was very anxious like something was going to happen and she tried to calm herself by taking deep breaths but does not know if that worked. Finally, after 3 hours she was able to go to sleep and did go to the bathroom a couple times and felt week with the flu like symptoms, they were very bad. When she got up today she was 60-65% better. She did eat something later yesterday and had thought the nausea was because she hadn't eaten all day long. The food was flat tasting and she know she has that whenever she has the flu where nothing tastes right. She clarifies she has that anyway since 16 years ago she had cancer and a strong dose of chemotherapy and radiation and her immune system since has not been the same and has been very deprived. Whenever she gets sick she gets deathly sick and has to be watched or she may have to get hospitalized due to weakened immune system. States some people say that the second dose is worse, is that true or is it the same feeling. If she feels like that with the second dose she may not get it. No further details provided. Mentions as the day goes on she comes around more. Has to get her glasses to see card given. No other vaccines given that day or 4 weeks prior. No problems with vaccines in past. The outcome of event her immune system since has not been the same and has been very deprived was unknown and other events were not recovered.  No follow-up attempts are possible. No further information is expected.