Re: Yeast

For severe yeast you will need the probiotics Reuteri or Sacharomyces Boulardi.  They attack yeast directly. 

Also, biotin prevents yeast from turning pathological (growing tentacles) and punching holes in gut lining.

Glutamine (which you're already getting from Champex)

N-Acetyl Cysteine (NAC)

Pantethine (not pantothenic acid)

Molybdenum, copper, zinc

These all work together to detoxify yeast by-products.

Digestive enzymes that digest chytin.  Omega Zyme (Garden of Life) has the enzyme that eats chytin.

Omega 3 fatty acid fish oil capsules will help both your gut and your skin re: the inflammation that causes the dermatitus.