Recently diagnosed with suspected Graves Disease…was managing okay, awaiting my Sept 13. first Endocrinologist appointment, until I got a tetanus booster on Monday. Wednesday night I went to bed at 930 and awoke at 11pm with a racing heart. Called an ambulance and was rushed to emergency…Resting heart rate reached almost 200bpm. BP at 174/78 T4 high, TSH and potassium very low. Stabilized on 50mg of metoprolol and 8 giant potassium pills over a 1 hr period. Prescribed 25mg metoprolol twice a day and potassium once a day. Friday morning 8 am same thing, awoke with a racing heart (only got into the 160s this time), and bp dropped to 80/48 in ambulance. Stabilized with 50mg metoprolol and prescribed 50mg twice a day. Heart rate consistently under 90 since but feeling like a zombie: insomnia, extreme fatigue and drowsiness, no appetite, can't concentrate. Has anyone else had a reaction post vaccine? Has anyone had a similar experience with Beta Blockers? And, do these symptoms eventually lessen, as I've been told?