Atrial fibrillation due to hyperthyroid.

I am suffering with atrial fibrillation for last 6 months due to hyperthyroidism. I am taking blood thinner eliquis 5 mg twice a day, Dilzium SR 90 mg twice a day, telmisartan (Eritel 40 mg) twice a day and petril 0.50 mg before sleeping. When my thyroid is in normal limit then bp n pulse also gets in normal limit. Although I have been taking these medicines continously for 6 months. When my thyroid was controlled, then I asked my cardiologist if medicines can be reduced, and he reduced Dilzium 90 mg from twice a day to once a day and also reduced eritel 40 mg from twice a day to once a day. It again increased my bp n pulse and i had to consult again and they again increased . My questions: 1:  Do I have to take blood thinner and bp/pulse medicines for whole life? 2: can these medicines be stopped or decreased if thyroid gets stable? 3: Is atrial fibrillation a heart disease and is there any risk of heart attack. My ecg, echo was normal. 4: Are pulse n bp related, both increase