@burcidi-- Mites sound highly plausible in your case. It might also be an allergic reaction to pets, mold, or personal care products.
Itching all over the body with no rash could also be a side effect of medications. I'm on thyroid medication because I have hyperthyroidism. When I started the medication, my skin itched all over for several days. The same thing happened when I increased my dose two weeks ago. So that's something else to consider if you don't have other symptoms.