You have very slight tears in your rotator cuff, I went through the same thing and take some glucosamine and MSM. You really need to take some time off and not do anything that involves your shoulder, or you can be bull headed like I was and continue to workout and not heal. In the end I ended up taking 3 months off, which sucked really bad, I just did cardio and some legs. You might get away with still doing some decline & flat benching if it does not bother your shoulder. I suggest you learn some rotator cuff exercises to do and do them to help strengthen those tendons, and don't use a heavy weight. After I got better, I now do the rotator cuff exercised first thing before I do any kind of benching, and have organized by workout to reduce the total number of reps involving my shoulder.