I took Multaq 9 years ago. For 3 days I had all the symptoms of a heart attack and just stopped. Scary! I honestly think I might not be here if I hadn’t stopped. The heart attack symptoms did not stop immediately but too long ago to remember the exact timeline. I do remember I had fatigue, weakness, dizziness etc. for the next 3 months but meds often exacerbate a rare neuropathy I have so that may not be the case for you. I have enzyme issues and am a poor metabolizer of most meds but that was the scariest one so far. Call your doctor ASAP.