I see BGfisher has told you but I'll say it agian.

I teach archery to kids so I have seen alot of what your going through...maybe not so much pain but I know beginners.

First your pulling to much weight. You need to start out light and work up to your 60 lbs. 40 lbs isn't a bad place to start. It may seem easy to pull 60 but if you tire that quickly your pulling to much. Back your bow down to 50 if you can. Or find a bow with less weight. You need to be worried about your form first not your groups.

Which prings me to the second point. Your pulling your bow more with your bicept than your back. Your back is WAY stronger than your bicept. Your form isn't right or you wouldn't be hurting as much. IMO. Backing the weight off helps. Try pulling with your back sqeezing you shoulder blades together. You should be able to pull your bow back with your back against a wall without having to raise your bow upward at all. Then as you get to full draw your elbow should point almost directly away from your target. This helps make your back work instead of your arm. Its a little hard to explain. You should be pointing your elbow back the whole time like your pulling with your wrist.

Forget the pain pills you took. Try ibuprofin (Motrin) and maybeNaproxen Sodium (Aleve),I cant spell them but you get the idea. Motrin is a anti inflamitory and Aleve is a muscle relaxer of sorts. Keep stretching and I think you'll be ok. I think the doc will tell you the same. If it persists a week or so I would go too but I'd give it a while.

Like I said forget your groups for now. Lower your draw weight and shoot close to the target. Don't worry so much were it hits. Worry about your form only. Draw, anchor, hold, Release, Follow through. Those are all you need to worry about for a couple months. It will make you a much better archer in the long run and keep you from developing bad habits that are nearly impossible to get rid of. As you get to the point your not tiring as much you can back off and shoot some more or raise you weight a little at a time. My guess though its a combination of weight and incorrect form/draw. Read up or ask questions about form and you'll be better off for it.

Hope you get better and back at it quickly.
Jason