Another thing to watch for "body Itching" is taking the medication Xarelto for blood thinning I am changing from this medication today. Peach

I was on Gabapentin and this did it to me Woke me up at night I was tingling all over weird feeling like I was shaky

Be sure you research the difference between the environmental skin prick test and the 5 Day Extended Patch Test for elements and chemicals. The environmental test is a 30 minute skin prick in the doctor's office with immediate results and it tests for environmental allergens like dust, pollen, cats, dogs, mold, grasses and so on. I have suffered with environmental symptoms, hay fever, since childhood and just cope with it like most and take antihistamines. The 5 Day test checks for things you mentioned like metals, rubber, and a host of other elements in common daily contacts. Antihistamines don't help me much for my Allergic Contact Dermatitis ACD. (Research about this chronic form of eczema). My test kit contained patches for 78 different chemicals and elements. This test gave me th names and were the reason for my internal skin issues. You mentioned that you were tested. Was it the 5 day patch test. You won't forget this uncomfortable, but not painful, test. If so you should have a specific list of results. Before you see a dermatologist or allergist do you homework about this test. Like you I had much to learn when this internal pain started 4 years ago and necessity forced me to keep searching.