Supplementing with l-theanine, taurine and magnesium can help to calm the nervous system. Plus, propranolol can help with the rebound anxiety attacks/racing heart. I'm in the same boat, although I wasn't on clonazepam nearly as long. I'm having a hard time functioning without it now/on a low dose. The anxiety is severe- worse than before I started taking it. I also wish I had never taken it.