Sammy, I am a very active cyclist. I had my ablation March 3rd. I did not exercise at my doctors advice for 10 days. When I started riding my heart rate would not go very high at all. I could only get it to 115 on a route that should have gotten me into the 150+bpm range. It also climbed very slowly. I was on Atenolol for about 10 days, and wasn't sure if it was the procedure or the drug. What I found was that it took me about 3 months to get my HR to what I would consider normal response. I would gain about one or two beats a week on my max heart rate. After 3 months I got my HR to what I thought my normal max hear rate should be, 181 bpm. It has been normal since. the only other odd thing I have encountered is that pre ablation I never skipped beats while I was working out. I now get skipped beats about every ride, 2-3 times per ride.
As Mike said, give it time. My cardiologist told me that the heart is like any other part of your body, if you break a bone, it might be knitted back together in 6 weeks or so, but it isn't done healing for a long time after that. Good luck
Larry