You know my son went through a very similar thing, first they said it was scabies, although is girlfriend did not get them, then bed bugs, finally excemza, i can never spell that word, but you know i think the last one was right, has tons of creams and potions and now seems to be ok, he was thinking it was something in the house ,as when he went to China and Australia he did not have them,i think stress made his condition worse,so could well be a combination of things, i sure hope it gets better,nothing worse than the itches,have you tried taking an antihistimine pill to help the itch, works a treat, good for chicken pox too.