I don't know what the exact issue is and I know most here are skeptical of giving their arm-chair analysis, but I think that would actually be a good place to start.
This has been an issue for over a month now, seems to have crept up out of nowhere- as in I can't pinpoint any isolated incident that would've triggered it. I experience pain/weakness in my left shoulder/armpit ONLY when doing pull-down movements for back exercises. Overhand/underhand/pronated grip all have the same effect. Oddly enough, I don't seem to have issue doing bent over back work or seated rows...only overhead pulling down movements. I can feel it throughout the day...it's not really pain, but it feels like my shoulder is just out of place and/or significantly weakened. Like when I go to open or door or sometimes pick up something with just my left arm...even when I do the movements that exacerbate the pain I can usually work through it-(however I don't do this because I know it's going to become worse down the road if I continue to do that and end up abandoning all pull down movements)
I had about two or three weeks off from the gym because of being on tour, thinking it would be a good chance for my shoulder/tendon/ligaments whatever to rest and take a break, but it seems to have only gotten worse during that time, not better. It has gotten to the point now where I can't ignore it or expect it to heal on its own.
I know the answer is to see a physiotherapist, but I am very skeptical as I've had bad experiences in the past seeing them (waste of money; inconclusive analysis) and because I'm currently un-insured. Thanks to obamacare I won't have a choice as to whether or not I'm insured in the next couple months so that won't be an issue, but for the moment I'm just looking for advice as far as what could be the problem, what to avoid, if foam-rolling will help at all, shoulder dislocates, or anything that could be of any use. Thanks