I try to post what I can, but I do not always have time to mention everything. I have experienced rashes, but thankfully not often. The most frightening one was from direct reexposure in the apartment 3 years ago. I developed a rash over my eye and scalp accompanied by a migraine for 6 days. That was the last time I ever went in the apartment again. Other than that, I feel my minor rashes (or just itchy hands) were due to ingesting the Pharma Sugar free Cholestyramine Questran. I highly suggest anyone taking it should have it compounded chemical free!
I am proud of you for taking your health matters into your own hand and succeeding. I agree that testing is sometimes useless. The popular mycotoxin test is $700 - outrageous. Fungus is fungus. I do however think testing is VERY useful for vitamin/mineral levels and hormones.
I will use your grapefruit idea if I ever develop a rash again. I wonder if the extract would produce the same results, because that I already have.