Hi oakleaf,
The injury started as a twinge last week when i was trying to save myself from falling off my bike. Then i tried to push something along that was way too heavy for me, hense i had a sensation of something ripping and the pain was intense. Doc says cant tell for sure but seems i must have torn a muscle. Told me to keep moving it but no putting pressure on shoulder as in drop handle bars for a few days then give it a try see what happens, also advised massage, an anti-inflammatory cream applied to the area and stretching, no uper body weights for the time being.
So watch this space i guess
furry duck