7 Weeks and I Can't Work.

I was on medical leave from my job because of depression. Today was my first day back, and I'm like dead. I can't feel my legs, the pain is worse than its ever been before. I was used to doing 8 hour shifts no problem. I'm crying from the pain. I love my job but Idk if I can do 9 months off this. I'm just so upset because I enjoy my job but being on my feet all day and then having to do physical labor is destroying me. I need some advice and support please. :(