Inappropriate sinus tachycardia and ectopic beats

The important question here is related to the origin of your "constant palpitations/chest pains." A proper diagnosis is the basis for proper treatment. If you are having supraventricular tachycardias then there are more medications than Atenolol that can be tried. I cannot comment on ablation without knowing the etiology of your discomfort.
It seems to me that seeing a cardiologist is the right move.
Please be advised that I am unable to diagnose medical conditions online.

Hi there Lenamore. I am in the process of of figuring out what is wrong with me and after 3 months of doctor's visits and testing I finally have a doctor who is really digging deep to help diagnose what is most likely IST. I had extreme fatigue, shortness of breath, palpitations and even fainted in the ER. I finally say an ELECTROCARDIOLOGIST and he was awesome. Also, I am on 10mg twice a day of Propranalol and that has helped. I am also on a low dose of Prednisone for another endocrine issue, but it seems to help with the fatigue. I have a treadmill stress test in two days which should give us some clear answers. This whole experience is very scary and forced me to be on short term disability due to the extreme fatigue - I could not even walk to the bathroom without my heart racing and having to lay down afterward. I wish you luck but highly recommend seeing an electrocardiologist and looking into a betablocker of some sort. Best of luck!
- Sweet-but-fast-heart