I truly feel for you. My son, who was bloody from head to toe, was referred to the head of pediatric dermatogoly at a major hospital when he was 6 months old. His eczema was absolutely awful!
Doctors had recommended everything to us, but this older gentleman suggested that it was not WHAT we were putting on it but HOW. He suggested that, instead of drying him after bath, to slather on the cream or lotion without drying. It seemed weird, but we were willing to try anything.
Within a month or two, his eczema cleared up and his skin was soft again. He is now 4 and tends to have eczema reappear when allergy season hits, but we still lotion him this way. We have a hydrocortisone cream for him but rarely need to use it. The lotion that worked best for us is the navy-capped Aveeno Baby, which is really thick and stays on even with wet skin. I tried Cetaphil on my own eczema and it did nothing, so I periodically pilfer from my kids' Aveeno supply. :)
Also... you may want to have him allergy tested if you haven't done so. You might be surprised at what you find.
Good luck to you!