Been mostly marathon training lately, with a few faster workouts, however did a mile time trial last week out of the blue. 3-4 days following that, I was having [progressively] increasing pain/soreness in my shoulder/collar bone area - which ultimately was affected by my breathing (each deep breath hurt more and more). Finally got it x-rayed and was diagnosed with a severe shoulder muscle strain. Taking anti-inflammatory meds now and it has seemed to work a little.
Anyone experience this before? Any thoughts??