Two weeks post ablation. No AF so far which is great but I get periods of really fast heart beats - 135-140. Usually about every other day, they last about one or two hours and leave me feeling really weak, cold and with a splitting headache. Can't say I'm overdoing things as I'm taking it really easy and actually getting quite bored. Has anyone experienced this as it is quite frightening. I guess what I would really like to hear is that it is quite normal and will go away with time. Any suggestions?