Been there too, you will get through this! Positive mental attitude will help a lot.
I also cannot eat red meat but I have found many tasty alternatives. It can get tough like when I was smoking a whole packer brisket and I couldn't eat any (ok I had one bite) but you will be able to eat very well without the red meat.
Poultry is a great choice and readily available. Turkeys, whether whole, breasts or drumsticks are all great. Ground turkey and chicken can be substituted for beef in burgers, meatloafs, meatballs. My kids are so use to eating ground turkey that they don't even like beef meatballs anymore. Cornish hens, chicken are all good lean meat choices; just don't eat the skin.
Fish is great too and lets not forget veggies like ABT's peppers mushrooms etc.
Much of the flavor in food comes from the seasoning and not the meat itself. Pick good rubs, marinades and sauces and I think you will find plenty of great items to smoke. Brine your poultry to add flavor and moisture, rub down your meats, use flavor injectors; lots of ways to add flavor.
I've read tons of articles on smoking meats as far as the health dangers and although there is suggestions that it is bad for you, other cooking methods have there own risks too. Everything in moderation.
I'll send prayers your way and if you need any suggestions on food choices, spices, rubs, etc. your friends here at SMF will be more then happy to help.