Hi Kelly,
It seems terrible all of the things your husband is going through! And with no help from the doctors! Have you tried looking at the side effects of any medicines including over the counter medicines and vitamins your husband takes? That may be a start. Also do research for foods that could help your husband's problems such as doing a Google search for what foods can help with pain or vision. By the same token, research which foods could cause some of his symptoms.

The other thing that can help but sometimes takes time is prayer. Pray constantly and often. God made your husband and he can heal him! I had bad migraines years ago. It took 2 years of prayers but God did heal them. Even my doctor put it in the record that my migraines were healed by God! I've also had some instant answers to prayers too regarding my health. It's worth a try! Have faith and things will get better for your husband and for you also!
I'll say a prayer for you and your husband.
PML