HH, lemme tell you something, bud...
PAIN IS MENTAL! ITS ALL IN YOUR HEAD! Block it out and keep pulling that bow. In fact, if you can find a heavier bow than that Howatt, pull that one! Feel the burn...and snap into a SlimJim!
Honestly, take it easy for a while, and work slowly back into it, with that Pearson Cougar, first. Remember my dads story? He used to pull a 60lb bow until he blew his shoulder out after taking 6 months off. Now he's pretty much confined to bows 45lbs and lighter.
Heating pads, ice packs and Vitamin I (ibuprofin) can help the discomfort. Dads chiropractor told me that after shooting and I'm sore, that I should rotate between a heat pack and cold pack, at 15 minute intervals for an hour after shooting. Could try that. But for now, I'd just lay off the bow for a while, then pick it up slowly with that 43lb'er. Luckily, at your age you still heal really quickly. When I was 17 and I got blasted by that car and broke my shoulder, I was casting for catfish 2 months later.
Good luck man! We fishing this weekend or what?? I gotta check your new ride out. My tubes all aired up and I'm ready to do some crankin, yankin and ripping some lip!
Cam