POSSIBLE SMALL STROKE; POSSIBLE TRANSIENT ISCHAEMIC ATTACK (TIA); SUPER DIZZY; THROWING UP; COULD NOT OPEN EYES; WIERDLY AND EXCEEDINGLY THIRSTY; COULD NOT WALK; NUMBNESS IN LEFT ARM; COULD NOT STAND; HEAVINESS IN LEFT ARM; NAUSEOUS; HEADACHE; FELT LIKE HAD CHILLS LIKE ONE GETS FROM THE FLU; This spontaneous report received from a patient concerned a 60 year old White, Not Hispanic or Latino female. The patient's weight was 175 pounds, and height was 65 inches. The patient's concurrent conditions included slightly elevated blood pressure, alcohol user socially and on weekends, non smoker, and penicillin allergy since childhood. The patient received covid-19 vaccine ad26.cov2.s (suspension for injection, intramuscular, batch number: 1805022, expiry: UNKNOWN) dose was not reported, 1 total, administered on 08-MAR-2021 for prophylactic vaccination. Concomitant medications included valsartan for elevated blood pressure, acetylsalicylic acid, and furosemide.  On 10-MAR-2021, the patient felt like having chills like getting from the flu, for couple of hours might be, a headache for several days, might be for 3 days. For that the patient took some Advil 200 mg every 6 hours for the first couple of days. Then that passed and felt fine. On 24-APR-2021, around 04:00 in the morning the patient woke up and felt weirdly thirsty, exceedingly thirsty and super dizzy, nauseous thought was having a heart attack and heaviness and numbness in left arm but could still move the arm, however could not walk and could not open eyes until was in hospital. As a treatment  Aspirin was given to the patient by husband. The patient was throwing up, could not stand. About 05:30 went to the hospital and ran many tests. Ruled out brain bleed, heart attack, anything cardiac did a CAT scan; bloodwork found that the patient was low in potassium and it was determined that the patient either had a small stroke or a TIA that dissipated on its own. The patient saw her cardiologist and wore a Holter monitor for 10 days. The patient also has an appointment with a neurologist coming up in June and having another CAT scan. Also seeing a vascular neurologist. The action taken with covid-19 vaccine ad26.cov2.s was not applicable. The patient recovered from possible small stroke, possible transient ischaemic attack (TIA), super dizzy, could not open eyes, wierdly and exceedingly thirsty, could not walk, throwing up, numbness in left arm, could not stand, heaviness in left arm, and nauseous on 2021, felt like had chills like one gets from the flu on 10-MAR-2021, and headache on MAR-2021. This report was serious (Hospitalization Caused / Prolonged).; Sender's Comments: covid-19 vaccine ad26.cov2.s-Possible small stroke, Possible  transient ischaemic attack , super dizzy, could not open eyes, wierdly and exceedingly thirsty, could not walk, throwing up, numbness in left arm, could not stand, heaviness in left arm. These events are considered unassessable. The events has a compatible/suggestive temporal relationship, is unlabeled, and has unknown scientific plausibility. There is no information on any other factors potentially associated with the events. covid-19 vaccine ad26.cov2.s-Nauseous. This event is labeled per RSI and is therefore considered potentially related.