This is a rough time to consider taking time off from weight training. Normally, I would say to back off if the problem is extreme. The advice I'm going to give isn't for a normal situation, but ONLY for this specific poster. If you can get ahold of some NPP asap, I would start that, unless you are already using tren. If you find that you are holding any fluid from the NPP, you would still have enough time to drop it out a couple wks prior to the show. Ice several times a day, 20 min on. Use a NSAID.
If you can train around it, using less weight and focusing on the squeeze, I would do that. Find what exercises work best and dont cause pain. Stick to them. I find that machines work well when trying to train through a tendon issue. The weight is stablized and you can focus on moving your body into a position that is comfortable to press from. If you find that over head presses bother you, you can get away with lateral raises for the next 6 wks. All you need to do right now is keep the muscle full. You aren't going to make any new gains, 6 wks out from a show, so don't worry about the weight.
If you are certain that this is a tendon issue and not bursitis, deep tissue massage will help. If it is bursitis, massage may add to the inflamation.