Yup, have exerpienced this twice with a real bad bout where I had to see a physcical therapist. This last time was about 5 or 6 years ago and after extensive work in my yard due to removing lawn and putting in tons of washed rock, as well at that time I was weight lifting hard, the darn thing tore fairly bad. I was out of doing anything for 3 months which sort of sucked a bit because in the final months I went to Cancun and it still bugged me a bit.
It's been fairly good since then and though surgery was an option at that time, it wasn't something I believe I needed. I still have problems and my shoulders are weak and it is important that I pay attention to the pains I have otherwise I could be rehabbing for longer and actually having surgery; and from what I know that isn't too good. But I believe this exta attention and good solid weight lifting with good form and technique have at least made me better then if I wasn't doing anything at all.
In December of 2004 I crushed my vertebrea and then reagrivated it in April of 2005. Both I assumed it was my rotator cuff because the symptoms were initially similar. Make sure that you get yourself checked out and identify what the real problem is and then look at getting treatment to get yourself back into a steady routine again.
Get better and good luck.
"IF I COME ... I'M BRINGING THE PAIN WITH ME"