As much as it seems to be in agreement, yup, you definitely need to see the doc. Aching and pain from something like that can actually end up being a bone spur occasionally. I saw something similar, a fall, happen to a friend of mine and his shoulder wasn't the same for ages and eventually went in to have an x-ray and they found that was causing his problems. I could see that being uber painful during sitting down and standing.

I hope you start to feel better and get to the doc soon. As is everyone else, my wishes will be with you.