Hi there. It sounds as if you are now suffering from "rebound tachycardia", a phenomenon where your pulse increases as a result from beta blocker withdrawal. If you need further information, please read my posting elsewhere on this board; hopefully you'll begin to feel better that you're not the only person experiencing this!
One plus thing about coming off the beta blockers is that I now feel that I am more energetic, and have more "zest" for life! That's what's keeping me going, although when times are bad, the temptation of going back to the beta blockers is great! But once you've made a decision on getting off it, try to stay off it if you can...
And I agree with zip2play, although I haven't had any experience with ACE inhibitors, I have read horror stories about them causing uncontrollable coughs. In fact, my cardiologist started me off on an angiotension-II receptor blocker instead of going to an ACE inhibitor, after I discovered that both beta blockers and calcium channel blockers were not doing a good job of regulating my BP! She acknowledged the side effects of ACE inhibitors, and assured me that the ARBs were much better with almost no side-effects, and had a protective effect on the kidneys