I suffered 3 years with demodex full body. Same experiences and symptoms, dozens of drs clueless to help. After all my research. This is what cured me 100 percent. I bought all my own meds because the drs weren’t going to give me shit. You’d think I was asking for opiates!! Shame on them.. wrote me off as parasitosis as I sat there looking like a crack addict with my body riddled with sores. Demidicosis full body. It was awful.  I used flagyl 500 mg oral 2x a day. And flagy gel 1 percent  and permethrin cream alternating every couple days with the topicals . Stayed on meds a month and a half. Staying on low dose flagyl daily for another month just to be sure the are gone. Hypochlorite acid spray after showered and face wash and waited a few hours to put the other topicals  on. Took a good month and a half to cure. The die off at week 4 was horrid. I actually thought I’d die. Ended up in er. The pain was excruciating. I lived. Hope this helps. I’m not a Dr or telling you to do. This is what I did to cure myself.. It’s what worked for me. Good luck. Gotta change bedding and spray odorless permethrin daily on every surface floor, furniture. Treat dogs with bath and odorless permethrin a few times a week and keep them corralled in one area until clean. About a week. The struggle is real… you are not crazy. Just lazy non researching drs who should all re read the hypocriatic oath again.  And again.