I can understand your concerns,but a picture of the affected areas would have been very helpful.
As you have mentioned that you have already been treated for scabies
with no help and also that you have very dry skin
so two things that i can think of right now are
Xerotic Eczema( a type of eczema which is related to a very dry skin)
Allergic Contact Dermatitis
and the allergen could be anything in the food,clothings,cosmetics or sometghing in the environment. So the bottom line is that you have to see your dermatologist
or at least your GP so that he/she can examine you fully and asses you further.
I hope you understand my position as i cant help you further with such a brief history and without seeing it is really hard to comment further.
ALL the best and thanks very much.