Miscali - good luck! There is a lot of support here. I am currently looking to switch from H to subs so I'm going to be on the withdrawal train too. Be sure you are drinking enough water. I know it sounds simple, but I have dealt with palpitations for a while. Coffee and cigs don't help either. However, I found that even with a lot of coffee and cigs if I drank a ton of water during the day that it would dramatically reduce their frequency.