Hey there Mcvay!
At the outset, am not entirely convinced that what you ail from is contact dermatitis
. It is always best to get a second dermatologist's opinion & a consensus on the diagnosis.
From your description, it could very well be palmoplantar pustular psoriasis? Is there a history of psoriasis that runs in your family?
Dermatology however is a visual line & one would prefer a clear digital image of the lesions especially on the plams & you may upload it on this site using the upload data icon to the right of your screen.
I also think if the disease is so widespread, even if it is contact dermatitis, it will require a course of systemic steroids
& antihistamines & just local creams may not help. I notice you said pills but what pills are your on?
Best of luck & wish you a speedy recovery & do hope you isolate the root cause of your ailment!
Dr Praveen Rodrigues MD