Fwiw, I've known a lot of people who have shot a long time that don't have an optimum draw. A lot of people draw with a low elbow which puts more stress on your arm/shoulder. Not trying to insult you, but just in case, make sure you are using a high elbow and your upper back muscles to draw/hold your bow. Also, consider a Saunders Power Pull to help with your strength. You can use one or both bands. It might be good for strengthening the right muscles.
Otherwise, I agree extreme cams are probably going to be a bad idea. I would probably start with a very weak bow for you and plan to replace it if you get strong enough. If you can find a low letoff eccentric wheel bow at least to practice with that would be good.
Good luck. I'm going to start back shooting again this year myself with a goal to bow hunt again and maybe shoot some competitions. We'll see.