he was having trouble walking; patient's pulse ox goes up and down.; Muscle pain; Tiredness; Diarrhoea; Weakness; Difficulty breathing; Nauseated; Headache; Feeling unwell; Been a little more dizzy than usual; This is a spontaneous report from a contactable consumer. A 59-year-old male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Lot number: EW0176, Expiry date: Unknown) via an unspecified route of administration, administered in Arm Left on 22May2021 at 14:30 (age at vaccination: 59-years-old) as dose 1, single for COVID-19 immunization at pharmacy. Medical history included ongoing vertigo (diagnosed years ago), diabetes mellitus from 1987, asthma (it has been so long since the patient was diagnosed with asthma that he doesn't remember when he was diagnosed), sleep, heartburn, allergy and high blood pressure (diagnosed with high blood pressure probably about 8 years ago). Covid-19 and pneumonia from Jul2020 to an unknown date in hospital with Covid-19 and Covid pneumonia. Concomitant medication included furosemide ongoing since 21May2021 as water pill; metformin ongoing since unspecified date for diabetes well over 5 years; quetiapine fumarate (SEROQUEL) ongoing since unspecified date and that the patient has been taking Seroquel for 5-6 years for sleep, famotidine (PEPCID AC) from a couple of years ongoing since unspecified date for burning; aloe vera, pramocaine hydrochloride (ATARAX ANTI ITCH LOTION) from a couple of years ongoing since unspecified date for allergy; simvastatin taken for high blood pressure, start and stop date were not reported and that the patient has been taking Simvastatin about 5 years or longer; glimepiride for diabetes that the patient has been taking glimepiride for over 5 years and ongoing. Patient did not receive any other vaccines within 4 weeks prior to covid vaccine. On 22May2021 the patient experienced a little more dizzy than usual, feeling unwell and on 23May2021, the patient had diarrhoea, weakness, difficulty breathing, nauseated, headache and tiredness, on 24May2021 muscle pain reported. Reporter states, the patient's difficulty breathing, they got the finger thing last night, 24May2021, to check the patient's pulse ox. Caller reported that the patient's pulse ox was down to 90. Caller reported that she doesn't think that the patient has had a fever or chills. Caller reported that dizziness was something that the patient has normally because the patient has vertigo. Caller reported that the patient seems like he's been a little more dizzy than usual. She has had to help the patient walk because of his increased dizziness. Caller reported that the patient's increased dizziness comes and goes but has been staying the same basically. She had to help put the patient in bed last night because he was having trouble walking from being so dizzy on an unspecified date. Caller reported that the patient's difficulty breathing has kind of gotten worse. Caller reported that the patient's SpO2 was in the 90's, then 92, and then 94. Caller reported that the patient's pulse ox goes up and down. Caller reported that the patient hasn't been vomiting but he feels like he is going to vomit. Caller reported that the patient can't really eat much. The patient underwent lab tests and procedures which included oxygen saturation: down to 90 on 24May2021 and oxygen saturation: 91 on 25May2021. The adverse events not resulted in Emergency room/physician office. The outcome of the event headache was recovering, gait inability and pulse abnormal was unknown and all other events were not recovered.  Follow-up attempts completed. No further information expected.