Hi there David.
I read your history & description of your itch & note that 15 years is indeed a long time to have suffered from an itch sans getting to the root of things.
For the moment as tablets are what yu are keen on & possibly be of more benefit for you, please take fexofenadine
molecule 180 mg once/day & this should help you get rid of the itch.
Moreover, it is non-sedative & relatively safe & am sure your local pharmacist should be able to supply this sans prescription.
Here's wishing you a safe itch free life!
Dr Praveen Rodrigues MD