Soloman: The pain is probably due to my lack of physical activity in a longer time than I'd like to admit.
Omega: I do have a couple lighter discs, and I throw them as often as the heavier ones, but I don't think the problem lies as much in the weight of the disc as it does my throw and follow through.
Trifocal: I play with friends who started about the same time as I did, and friends that have been in the game for years, and I learn a little bit from everyone. I practice when I can, but I live in a small apartment, and I can't much practice in here. On the upside, I've got 15-20 foot putts with no wind locked down.
Sidewinder: Backhanded, and no, no noise or immediate pain, it's just sore at the end of a round.
Dave: I'll try loosening up, because I do feel a little stiff throughout my throws. Also, I see what you mean by keeping it low. I tend to throw a little high, and that, paired with the stiff muscles during the throw and the lack of muscle movement in the past God-knows-how-long, are probably what are leading the a sore shoulder at the end of the day. Also, do PDGA members get a discount at Holiday Inn?
All in all: I consulted the forum just to make sure nobody thinks I'm doing something that will lead to long term muscle or tendon damage. I think I'll just tweak my throws and follow through's, and not try to strong arm it so much until I get that down.
Thanks all!