She has also has dizziness; She is pitching forward like vertigo; The dizziness got much worse this weekend; Memory issues; Confusion; Weakness in her legs; Pain in the back of her head, neck and above the ear and up to her skull; Pain in the back of her head, neck and above the ear and up to her skull; Pain in the back of her head, neck and above the ear and up to her skull; Nausea; Not feeling right, very tired; Not feeling right, very tired; This is a spontaneous report from a contactable consumer. A 76-year-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Formulation: Solution for injection), dose 1 via an unspecified route of administration, administered in arm left on 27Jan2021 16:30 (Batch/Lot number was not reported) (at the age of 76-year-old) as single for covid-19 immunisation. The patient medical history included digestive system, blood thinner, acid, high blood pressure, diverticulitis she went into the hospital in 12Nov2020 or 13Nov2020 for an emergency for diverticulitis and then while she was there, she was sleeping and when she woke up, she had atrial fibrillation. They did the electric shock to get her heart back without sedation and that had an effect on her. Mentions she had another episode of atrial fibrillation about three years before, but it went back on its own. She was also diagnosed with diabetes mellitus at this hospitalization on an unknown date in 2020. Concomitant medications included famotidine for acid at 40mg twice a day via oral, lisinopril at 5 mg via oral for twice a day taken for high blood pressure, metformin at 500 mg daily via oral taken for diabetes mellitus, metoprolol at 25 mg daily via oral taken for blood pressure measurement, lactobacillus acidophilus (PROBIOTIC ACIDOPHILUS [LACTOBACILLUS ACIDOPHILUS]) daily (expiration date: Jul2022, Lot number: WHD204) for digestive system, rivaroxaban (XARELTO) since on an unknown date at 220 mg daily via oral taken for blood thinner. The vaccination facility was a medical centre. The vaccine was not administered at (name) facility. History of all previous immunization with the Pfizer vaccine considered as suspect was none. No additional vaccines administered on same date of the suspect product. The patient didn't receive any other vaccines within 4 weeks prior to the COVID vaccine. Patient states she just wanted to report an experience after the vaccine. On 27Jan2021 (Wednesday) she went to the place for vaccination. It went very smoothly, and she didn't feel anything. The patient mentioned that she thought maybe it was her medicine and stopped taking her over the counter probiotic. The patient had problems, so she stopped this a couple of days before for the over-the-counter probiotic she stopped. On an unspecified date, in hindsight she thought some of the effects she was experiencing might be related to the vaccine. She was not sure if she was allergic to her usual medications or not. On 28Jan2021, the patient reports she had a lot of nausea; and not feeling right as in very tired. She didn't connect it to the vaccine. She thought maybe it was her medicine and stopped taking her over the counter probiotic. On 31Jan2021, she reported that weakness in her legs, pain in the back of her head, neck and above the ear and up to her skull. On 01Feb2021, she had worst memory issues and confusion. On an unknown date, she stated that she had had a lot of trouble with confusion doing her check book and questioning things that she did not do usually, and she also has dizziness and feeling like pitching forward like vertigo. On an unspecified date, the patient reported dizziness got much worse this weekend. She was supposed to get the next dose on 17Feb2021. The patient visited physician office. The outcome of the events the dizziness got much worse this weekend, she is pitching forward like vertigo was unknown. The outcome of the events pain in the back of her head, neck and above the ear and up to her skull was resolving whereas other events was not resolved.  Follow-up attempts are completed. No further information is expected.