I have just gotten the same injury... The same exact symptoms.

I had a stage 2 seperation 2 yrs ago and the doc gave me pain killers and a clavicle brace. He told me "if you are still experiencing pain after 3 months you most likely tore your rotater cuff, make sure not yo weight train".. 11 months later the pain finally subsided under 135 lbs.... So I began to train again. I was always cautious and went the natural route. After a year I got my strenth back up. Entering the 300 club on flat bench did my ass in.
I am now gonna schedule an MRI. I hope for the best but my gut tells me I am gonna suffer the same fate as you did. FUCK!!!!!

I will keep you posted....