Infestation On Face And Scalp Causing Brown Scars. What Could It Be?

Question: I have an infestation of some kind on all my body and scalp and face.. I don't know what it is. I get a lot of small red spots which turn into reddish brownish spots.I seem to have allergy to something or some pest. They seem toy bite at night mostly and live me a type of spots which spreads everywhere and are very unbearably itchy I feel like scratching every ten seconds or so .Once I had like a war of biting ants burning and fighting on my thigh, another time I woke up wit the same reaction on my arms.Once I had a cut just between my thomb and my index, they seem to have rushed to the blood around that cut and left 4 brown marks alon the cut.
Also it is going to be rather unaesthetic.I "found am few left overs" of these pests on my pillow, on my bottom sheet.
Those "left overs" are little brown or black, they are really very little.I picked up some with twizers. My doctor is on holiday. He had given me a script Called Periactin but then the spots were not as numerous.
I just had a itch behind my ear, next one will follow anywhere anytime. I don't know if it is a bedbug or what.I do wish someone could help me.My son had his luggage from Europe via Asia in my bedroom. Does that help?My doctor also told me that my auto immune was low. Thank You.
I have just told you my problem. That' s all , Thank You.
I have a skin problem. That's all.
I have nothing left to say.