What Causes Infection On Feet Spreading All Over The Body?

I have been battling an infection, which I think began on my feet, and has since moved to my entire body. I have been to 4 doctors and they say it s a parasite but all of them are stumped. I tried to get a jump on this rash but now it has advanced so much that it s on my entire body. Along with being very itchy, I can see tiny white specs, which I think are either eggs or the organism, all over my body. I see the most activity in the morning and at night on my lower legs (calves & feet), on my arms from elbow to hands, and on my head. My scalp is extremely itchy and I m picking off these white objects that are coming out of my pores. I thought it was just big pimples at first but they aren t. I m 32 and know that there is something infecting these pimple looking spots on my face and scalp. I have also found that almost every single hair of my face has something on them. The hair is either infected or this parasite is attaching itself to them somehow. I thought it was ingrown hairs and tried pulling them out. That s when I found out. These white, almost clear, organisms are in my mouth and my eyes now. I see them on my eye lashes. When I m able to, I ll pull off the ones I can feel moving from my legs, arms, and especially my face. Over the past 5 weeks, I ve taken benedryl for the itch but it hasn t helped. Also, scabies cream(5 weeks ago), pinworm pill and again 7 days later(4 weeks ago), parasite pill 7 days ago with a refill I m getting tomorrow(last week), and just bought a pinworm liquid from CVS 2 days ago to try again. These whitish objects are coming off in different lengths. I can t tell if it s a worm or a mite. And my dermatologist doctor told me that it s not scabies. I ve gone through everything trying to kill whatever this is. I treated it as fleas in the beginning, then bedbugs, then lice. It has started to leave sores on my wrists and face and I can see something under my skin but don t want to pick at it from fear of causing more damage than good. I ve also lost 25 lbs even though I eat like crazy in an attempt to counter the effects if it is an internal parasite. Please, any direction or input as to what this might be so I can finally kill this thing would be extremely helpful. Thank you so much!