It seems it could be RI. I would definitely take him to a vet as soon as you can. Some vets do payment plans. I had trouble with money but my mom helped me out with the vet. My Kingsnake recently had RI but I got him on antibiotics for two weeks and he's all better now. I would definitely take him to the vet. Call your vet and ask how much it is for a visit and how much money it is for antibiotics. Your snake cannot get over RI (if it does have RI which it seems like it) without antibiotics. It just gets worse and worse and RI is fatal. To me, it seems like your snake needs immediate attention because the RI seems to be pretty bad right now.