Have you taken or considered taking oral Ivermectin ? I think my mite problem may exceed the topical remedies, but hopefully I'm wrong. Taking it sounds pretty scary. I don't recall seeing if anyone has posted about going that route.
I am a "possible suspect" for a compronised immune system based on what was diagnosed, by two very young doctors. Not impressed by either one. I will reject that opinion until I see a "specialist" who confirms it. Maybe just wishful thinking.