My 14 year dog, had no major health issues till last weekend. She has arthritis and had a real bad flare up. We saw a vet on Thursday and she was prescribed Tramadol, Gabeptin, Caroprofen. She was also given a shot of hydromphone, and cernic for nausea, and started to feel better as of Saturday. Although, she has nibbled on food here, but no real meals. Today she was acting like she was in pain and still not eating. She is drinking lots of water, and going to the bathroom like normal. I have tried several different things for food. Please help.