I feel you bro
I've had quite the same problem for the last 2 years, lost a shitload of weight, wasn't able to train, and as a result had to have surgery on both shoulders (subacromial decompression). I've resumed my work-outs 2 months ago and so far so good. The problem here is that some people get past this problem with physio sessions, and are back on track after 2-3-4 months, while for others they don't do shit. The good news is that you've done a good move by resting and taking those supps.
I suggest you do some physio sessions, then try to train with light weights to check by yourself if they did any good; if not don't waste your time and go and see an orthopaedist and go for the surgery. I've wasted too many months trying this and that...I've had the first shoulder done late june and the second one mid-october; after two months of rehab on both you'll be able to resume your work outs. Hope nonetheless that you won't need to do it.
Here's a link that should help you: www.shoulder1.com
Wish you all the best, keep us updated.