Heart attack; Panic attack; Booster; muscles in her chest, sternum area and her gut felt like they were clinched up tight/neck was extremely tight down; shaking internally; her heart bpm was at 108/BPM increased every day; This is a spontaneous report received from a contactable reporter (Consumer). The reporter is the patient. A 68-year-old female patient (not pregnant) received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE), administered in arm left, administration date 06Dec2021 10:00 (Lot number: FJ8757) at the age of 68 years as dose 3 (booster), single for covid-19 immunisation. The patient's relevant medical history was not reported. Concomitant medication included: lisinopril taken for hypotension, start date: 03Dec2021; VITAMIN D2; EVE Multivitamin. Past drug history included: acetylsalicylic acid;oxycodone hydrochloride (Percodan), reaction: "Allergy". Vaccination history included: Bnt162b2 (1st single dose, in arm right on 29Jan2021 08:30 AM(Batch/Lot No: EL9262)), administration date: 29Jan2021, when the patient was 67 years old, for COVID-19 immunization; Bnt162b2 (2nd single dose, in arm left on 19Feb2021 08:45 AM (Batch/Lot No: EN6201)), administration date: 19Feb2021, when the patient was 67 years old, for COVID-19 immunization. The following information was reported: IMMUNISATION (medically significant) with onset 06Dec2021 10:00, outcome "unknown", described as "Booster"; MYOCARDIAL INFARCTION (medically significant), outcome "not recovered", described as "Heart attack"; PANIC ATTACK (non-serious), outcome "not recovered", described as "Panic attack"; MUSCLE TIGHTNESS (non-serious) with onset 06Dec2021, outcome "not recovered", described as "muscles in her chest, sternum area and her gut felt like they were clinched up tight/neck was extremely tight down"; NERVOUSNESS (non-serious) with onset 06Dec2021, outcome "not recovered", described as "shaking internally"; HEART RATE INCREASED (non-serious) with onset 06Dec2021, outcome "not recovered", described as "her heart bpm was at 108/BPM increased every day". The events "heart attack", "panic attack", "muscles in her chest, sternum area and her gut felt like they were clinched up tight/neck was extremely tight down", "shaking internally" and "her heart bpm was at 108/bpm increased every day" were evaluated at the physician office visit. The patient underwent the following laboratory tests and procedures: heart rate: (unspecified date) 69 bpm, notes: norm; (unspecified date) increased every day; (unspecified date) 92 bpm; (unspecified date) 89 bpm; (unspecified date) 72 bpm, notes: normal; (06Dec2021) 108 bpm; (06Dec2021) 74 bpm; blood pressure measurement: (06Dec2021) normal. Therapeutic measures were not taken as a result of myocardial infarction, panic attack, muscle tightness, nervousness. Therapeutic measures were taken as a result of heart rate increased included put pressure on sternum, abdomen, massaged carotid artery, deep breathing, walking. Clinical course: On an unspecified date (reported as "night of 10/6"), Patient woke up around midnight feeling like she was having a panic attack or a heart attack, it was really bad feeling. On 06Dec2021, the muscles in her chest, sternum area and her gut felt like they were clinched up tight. She was shaking internally, but it wasn't her heart causing the shaking. No rapid beating. It was in her chest area, which was why she thought this was a heart attack. Her pulse rate was about 74 bpm, so not fast enough to cause the shaking sensation. Patient fell asleep around 3:30, and felt fine next day. The same thing has happened every single night ("since 10/6"), though patient didn't feel fine during the day now. Yesterday evening was the worst. Her neck was extremely tight down both sides from ears to chest. Although BP was normal, her heart bpm was at 108 vs norm of 69. BPM increased every day. Put pressure on sternum, abdomen, massaged carotid artery, deep breathing, walking. Brought down from 108 bpm to 92 to 89, then normal around 72. Patient felt better today, but was worried about tonight. Prior to vaccination, the patient was not diagnosed with COVID-19. Since the vaccination, the patient has not been tested for COVID-19.