tebop, I don't know where you live, so this may not apply to you.  But in a lot of states and cities in the US, there are free clinics that you can go to if you cannot afford to go to a doctor.  We even have several hosptials here that will give you treatment if you don't have insurance. 

Anything that you read on the internet can be suspect, if you can/do have an area that has  free clinics, then you need to get to one and get your shoulder checked out.

I hope you feel better soon!