I agree, go to the ER. Before my ablation sometimes I could get a very rapid a-fib/flutter and my h/r would go well over 200. Whenever this happened I would get severe chest pains and on some occasions I would pass out. My EP told me whenever I got chest pains with my a-fib it was time to go to the ER.
Not to be an alarmist, but, I would say to go to your closest ER STAT!!. Chest pains accompanied by shortness of breath is nothing to play with. I am glad you took the aspirin, now, get to the ER as soon as possible.