Had atrial fibrillation, too much thyroxine, on 150mg , down to 100 straight away, on beta blockers and aspirin, will i get off these pills?

Most likely: If the atrial fibrillation was from too much thyroxine and not from an underlying heart problem, you should be able to get off the beta blockers and Aspirin eventually.

Possibly: If the atrial fibrillation is self-limited and clearly the result of excess thyroxine, the beta blockers and Aspirin could eventually be discontinued. If you have persistent or recurrent episodes of arrhythmia despite proper thyroxine dosing, long-term medications for the atrial fibrillation may be necessary.