<<Disclaimer: Verify this information before applying it to your situation.>>

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I had the same reaction to nuts. I was using coconut oil for a year
before I clued in. Also in some toothpastes there are coconut
derivatives. Cinnamon makes me itch too.
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Have you checked your laundry detergent? Deodorant? Shampoo?  Pet
food? Windex stops the itching and hives.
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MD put me on Atarax (in addition to the zyrtec I was already taking).
Atarax taken before bed results in a deep night's sleep - and NO
itching! Now working with an integrative MD using an
"anti-inflammatory diet": eliminated all except for chicken, fish,
fruit and vegetables. This brought my Atarax down to one fourth of a
pill!
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I found out that other foods were bothering me: corn, nuts, beans.
After taking these other foods out of my diet most of the symptoms
have subsided.
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You may need help with stomach acid.  If you don't have enough of
that, you can't digest properly.
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Have you considered "chiggers"? The little bugs chiggers burrow under
the skin and hide in warm moist places.

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