I can certainly understand John's thinking that he's the only one with hydro. Been there, done that, for 23 years.
Do you know if his sugar was ever low? I have hypoglycemia and always have. I am now working on losing half of myself (and succeeding!!

), due to severe, chronic hunger and picky eating for 40 years. I understand that low sugar can pose a higher risk for diabetes later on. (I think I was technically considered pre-diabetic before I started losing. I was at 107.) I also know that conditions like hydro (or anything neuro, really) can result in blood sugar imbalances.
Also...Is he a big guy? I'm sure you have heard it all before, but weight control will probably help some, too. PM me if you want some info on what I'm doing.
((((((((((((((HUGS))))))))))))))) to you and John,
LIZARD