...and I didn't cry or anything 
I tripped over my laces and went down like a stone.
I twisted slightly to avoid falling on my bad knee and landed very heavily on one side. At the time I was so bloody embarrassed (friends who were with me helped me up) I just carried on - we were out on a walk.
This morning my shoulder is really sore. I can lift my arm up to shoulder height but it feels heavy and painful.
I'm sure it is just muscular (mind you, I thought that when I broke my leg
although that was immediately very painful, this wasn't particularly).
So what now, any suggestions to help with the pain (have taken ibuprofen today which helps a bit) or to get it back to normal?