I know you're tired of going to the doctor
. And yes, it's weird. The only thing left that I can think of is heavy metal toxicity.
And if your doc cannot be bothered by it then it's time to find another who's more interested. Maybe someone who specializes in metabolic disorders. It can take time to find a doc that works for you. You never really know how good a doctor is or how good your insurance is until you face some of these more complicated cases.
If I think of anything else, I'll post it later. In the meantime, you may want to look at Chirley's post on copper. She basically has the same type problem but with copper.