Shaking chills; I could feel my in heart like somebody pressing finger just like keep punching in it like pushing in it; it was really horrible feeling, I am afraid to get the Booster (Covid-19 Vaccine); I was tired; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 65 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 30Apr2021 (Lot number: EP7533, Expiration Date: 31Jul2021) at the age of 65 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "Osteoporosis" (unspecified if ongoing), notes: Verbatim: Osteoporosis. Concomitant medication(s) included: ALENDRONATE SODIUM taken for osteoporosis. Vaccination history included: Bnt162b2 (Dose: 1st, Vaccine first dose LOT#EP6955 , Vaccine first dose expiration date: 30Jun2021), when the patient was 65 years old. The following information was reported: CHILLS (non-serious) with onset 2021, outcome "unknown", described as "Shaking chills"; CARDIAC DISORDER (non-serious) with onset 2021, outcome "unknown", described as "I could feel my in heart like somebody pressing finger just like keep punching in it like pushing in it; it was really horrible feeling, I am afraid to get the Booster (Covid-19 Vaccine)"; FATIGUE (non-serious) with onset 2021, outcome "unknown", described as "I was tired". No follow-up attempts are possible. No further information is expected.  Follow-up (06Nov2021): This is a follow-up spontaneous report from a contactable consumer. A 65-year-old female consumer (patient) reported regarding event details and product details.  Follow-Up (10Nov2021): Follow-up attempts are completed. No further information is expected.  Additional information: When probed for the concern, consumer stated, I had the Pfizer first (dose) shot and then I had the second dose on 30Apr (Further not clarified the date). The next day after the shot I got shaking chills and everything that and they said you should have until Friday and on Saturday it was my heart and actually I could feel my heart in there like somebody pressing finger just like keep like punching in it like pushing in it, which was really horrible feeling but I was so tired, I didn't call the Doctor because it was a side effect, so it was horrible, so it went away and then 2 months later it did not ended up it was with same feeling, my heart 2 month later feeling same like that. I started to hear somebody commercial that some people get enlarge heart and then I was reading the facts on Pfizer and it  says something about feeling having chest paining, fluttering and pounding in heart in heart, so I guess my question is I am just nearly about getting the Booster (Covid-19 Vaccine). I am afraid to get the Booster, when I went to the Doctor I mean he wasn't in the I mean after it was a couple of week ago, I told him about my symptoms and he listen to my heart and he said he doesn't see anything wrong with it now but whatever that was I don't know what was but what weird is my nephew who did not have the shot. He got Covid in January and he told he said he thought he was, he is like 35 years and he explained his heart felt the same way what happened to mine. I am afraid now, I don't know what to do and you know my Doctor says you can switch, I mean you can do Moderna but I don't know what to do.