well, for starters you can be a flight instructor, banner towing maybe. You may be able to get some part 91 gig as SIC in a citation. Not sure though. Have you tried jumping through the hopes to try for a 1st class. Not sure about the restrictions but, I had a student get diagnosed with high blood sugar borderline diabetics and he lost his Med. He will be getting it back. They put him on pills and proved to be able to control it so he is in the long process of getting it back.