I went to the gym last night, and did weights for the first time in 5 weeks. I took it relatively easy; I did much fewer pushups than I usually would, and when i did my weights, I used 1/3 of the weight I normally would have. That seems to have been about right; my shoulders were stiff afterwards, but the good stff that comes after working out instead of the ache of reinjured muscles. I'm going to have to continue to be careful over the next month or so, but at least I can start doing something again.
I ran into the guy who organizes special classes at the gym. He asked me where I'd been at jujutsu (he's in that class), and let me know that another session is starting this weekend. He said something to the effect of "Oh, well, another session is starting this weekend, but if you've got a shoulder thing...".
I'm feeling kind of down about the state of my body (not just my shoulder), and kind of down in general.