Dennis and Gail,
I keep you in my thoughts and prayers.
The same thought that ran through Noreen's Don's head ran through mine -- Radon. It's a very bad problem in many areas and can really wreak havoc. Testers aren't expensive, and you might could ask your doctors if it could even possibly be a cause....
Another thought is deer tics and Lyme Disease. I've two good friends with completely different medical problems (one neurological and the other digestive tract related) that have completely deteriorated their systems for the last several years. After many years of being sick/completely disabled and going through treatments, medicines and operations with no improvement (and worsening/damage from same), they both were found to have lyme disease and that it had caused all their problems. I make sure that DH and I are checked every year for this even though my doctor thinks I'm crazy. I've just seen the devastation it's caused and get the test so that we could be immediately treated if we have it.
Gentle hugs, Eve