i hurted it

Yeah, I guess this is my first real "sports" injury.  Perhaps I have been a little overzealous with the weights.  I hurt my AC joint and the pain has slowed me down for about two weeks now.  It's not separated, but I guess I have a touch of arthritis there.  I had gotten to 130+ pounds with the shoulder press and I was doing 2 sets of 25 reps.  After the pain started, I haven't been able to do the shoulder presses; they are too painful.  Even with 30 pounds of weight, I could only do 8-12 reps of the shoulder press, bench press, military press or whatever.  Since the injury, I have been doing 30 to 40 pounds with 100 reps with fly, pull down and rowing.  I have not stopped with the ab, leg and cardio work.  I found out that the ymca I am going to has "battling ropes" but with the shoulder injury, it may be some time before I can actually use them.  Stretching it seems to help so I will do that.  I sleep sitting up since I tend to roll over on my right side while sleeping on the bed (probably why I have arthritis).  I can't afford this kind of a setback, so if there is anyone out there that happens to read this, let me know if there is any kind of stretch or anything at all that helps.  Particularly if you have had a similar type of injury or arthritis in the AC joint.  Thanks for reading!