Docs office or hospital?

So I have arthritis and scoliosis. I started working in retail about 2 months ago and normally a persons body would get used to it but mine hasn't and I went to a hospital and they didn't do anything. I have no insurance so I would like to know if it would be better to go to a doctors office or a hospital because I think they might need to run scans or something. I Dont think docs office would be able to. So plz anything to help