Cheri:
I undeerstand your perplexity. The symptoms don't sound like eczema, but they also don't sound like eryhtromelalgia. When you are xamined by a whole bunch of dermatologists as you were, and the best they can do is guess (this happens oftener than we like to admit), the best approach is to treat the symptoms as best you can and see what happens. Sometimes time is the best diagnostic test, and many fascinating but undiagnosable conditions go away with no diagnosis ever established. At least you should take comfort from the fact that nobody thought this is a serious or systemic condition. I would work with your doctor, who sounds quite conscientious, to see whether topicals, antihistamines, etc, give you enough relief to get by. Time, I think, will tell.
Good luck. I think you will do well.
Dr. Rockoff