Dont over carb or try to regain too much weight, especially with your gas issues, your stomach waist will blow out,and you can't afford that your not carrying enough size, and Its not a who weighs more contest, get up there accept your fate, the realisation will either retire you or inspire you. Good luck, easier at 43 with your resting heart rate to just train as a hobby. I mean that in the nicest possible way, you need to see a cardiologist and not the one you are currently seeing, there are underlying issues at play and you are reducing your life expectancy by ignoring it, you need to get it down even medically, where it slows your metabolism as a consequence and you can't stay as lean, just accept it, there's more to life than trophies and thongs. the iron warrior crap is over rated ask many of the guys on the board. Peace.