was running a little fever; I do not feel great, you know what I mean; my head is a little cloudy but anyway; it woke me up; I was so cold; it was kind of scary last night, the shaking so hard. I could not get warm."; my teeth were rattling; I could not even get up to use bathroom; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  An 80-year-old female patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 26Oct2022 as dose number unknown (booster), single (Lot number: GJ2624) at the age of 80 years for covid-19 immunisation. The patient's relevant medical history included: "Blood pressure high" (ongoing). Concomitant medication(s) included: ATENOLOL taken for hypertension; HYDROCHLOROTHIAZIDE. Vaccination history included: Comirnaty (Primary Immunization series complete), for COVID-19 immunization.  The following information was reported: MOBILITY DECREASED (non-serious) with onset 26Oct2022, outcome "recovering", described as "I could not even get up to use bathroom"; FEELING COLD (non-serious) with onset 26Oct2022, outcome "recovering", described as "I was so cold"; TREMOR (non-serious) with onset 26Oct2022, outcome "recovering", described as "it was kind of scary last night, the shaking so hard. I could not get warm.""; INSOMNIA (non-serious) with onset 26Oct2022, outcome "recovering", described as "it woke me up"; CHILLS (non-serious) with onset 26Oct2022, outcome "recovering", described as "my teeth were rattling"; MALAISE (non-serious) with onset 27Oct2022, outcome "recovering", described as "I do not feel great, you know what I mean"; FEELING ABNORMAL (non-serious) with onset 27Oct2022, outcome "recovering", described as "my head is a little cloudy but anyway"; PYREXIA (non-serious) with onset 27Oct2022, outcome "recovering", described as "was running a little fever". The event "my head is a little cloudy but anyway" required emergency room visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of insomnia, feeling cold, tremor, chills, mobility decreased, pyrexia, malaise, feeling abnormal.  Additional information: While paraphrasing the concern: Consumer stated, "Exactly yes, Patient was okay. Patient just wanted to report this. She was okay. Her fever has went down. She do not feel hundred percent but she was okay. You know, she do not think she need to go to the doctor or hospital or anything like that. She just wanted to report it and let you know what had happened just in case it happened with anyone else." Consumer was informed about the role of Pfizer Drug Safety. No Any prior vaccinations (4 weeks Prior). "It was called (Vaccination Facility Name withheld). It is a grocery store with a pharmacy in there and that is where she went." Treatment for event: Consumer stated, "This morning, she took a couple of Tylenol." Other medical conditions and Concomitant medications: Consumer stated, "Well she take other medications but she was not suffering. she just take a high blood pressure pill and a water pill and that is, basically everything else was over the counter like a calcium tablet, fish oil tablet which her doctor knows all about, but the prescription medications are really the only 2 things. The blood pressure medicine was called Atenolol that is blood pressure 25 mg one daily. This was just a water pill it was called 'Hydrochlorot' (Further medication name was not appropriately clarified), it was also 25 mg." Reassurance: Consumer stated, "No, that was it, like she said she was not feeling that terrible, she mean she do not feel hundred percent but anyway. She just kind of wanted to report it just in case anybody else had the same problem. You know, She have always had Pfizer. She had all the shots for Pfizer and she had never had any problems and this time she just felt a reaction, she do not know why (Hence MI made) but anyway, she just wanted you to know."