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This is Dr. David
it sounds like the new medication is causing excessive stomach acid and acid reflux
what new medication are you taking now?
dizziness and slow heart rate can be due to low blood pressure, or thyroid hormone problems, or infection
you might need a strong stomach acid blocker to decrease stomach acid.
you need your thyroid hormone levels checked as well.
you might need a holter monitor to check for abnormal heart arrhythmias
you need an EKG as well.
you might need a pacemaker to better control your heart rate
slow heart rate is called bradycardia and can cause dizziness.
let me know if you have questions