I have a friend going through a similar problem. His differs in that his toe nails are all yellow/gray too.
I have a Heart Condition. My heart zings like that without meds all the time!
My Average was 126 bpm! I spent an entire Month in and out of the hospital having droods of tests done and I mean a lot of test!!! The "claim" mine is from aniexy making my heart race? I am still not convinced this is what is really making my heart race.
Find a Good Cardio Dr. and see what they think? Don't be like me and put if off!! I worry myself sick for a good month or so before I break down and go