Gunther isn't on painkillers, just anti-inflammatories. He's on Carprofen 75 mg. It works really well with him and he was in as much pain with his as yours seems to be now.
How long did it take him to be OK? How old was he when it started?
Carproven = Rimadyl I guess. Will have to decide on that one. I hate for him to be in pain.