Mindful meditation helps me a LOT. It took a long time before meditation had a positive impact, almost a year of practice. I was skeptical at first but tried it anyway because I felt that I didn't have anything to lose. Taking 5 min per day wasn't going to make my symptoms any worse and so I thought, why not try it.

I try to do 5 min of mindful meditation every day - I don't always get to it every day - and suddenly I noticed it was working !! I am able to concentrate better and have reduced the amount of rapid heart beat sensation. Perhaps you are somewhat like me in that it will take a long time of practice.