Quitting klonopin is a very stressful thing to do, so if you start again, and have to quit again, you have to go through the stress that puts on the body again. Also, long-term use of benzos is thought by many researchers to permanently affect adversely the brain's ability to adapt to stress, so if that's true, that's another strike against going back on a drug that is addictive and very hard to stop taking. My own thoughts on this are that these kinds of things have causes, and taking drugs don't address those causes in most cases, they just deal with the symptoms. Your specialists are the people to talk to, and if you're not getting what you feel is any move toward learning why this is happening and therefore how to treat it, then you might consider going some place where they're known for doing better work, such as the Mayo Clinic, or Johns Hopkins or a university hospital practice that specializes in heart problems. Now, if your problem is being caused by anxiety, that would make more sense for the benzo, but would also make the other drugs unnecessary provided the benzo successfully treated the anxiety, or perhaps an antidepressant that successfully treated it, or therapy and the relaxation techniques that go along with it such as breathing exercises, meditation, and exercise that accompany therapy. We have no idea from your post if there's a disease state going on here or what the cause is, and we're not doctors, so we can only offer suggestions for you to pursue. I hope whatever you do works, but again, if a benzo worked for you, and it doesn't treat your problem, it only helps GABA work better to relax you, then is the problem a disease state of the heart or is it a disease state of the brain, a mental illness? You probably know and that would seem to go a long way toward answering your question.
Everyone's experience will be different so you won't get useful info from that. Why did you decide to get off it - did you tell your doctor that or give another reason? Did doc put you on it originally to deal with the tachycardia?
This is a typo "4 years, a. Dry long time. "