Start taking baths with Epsom Salt and borax. Maybe you could get your boyfriend to take a long hot bath? Add in borax when you wash your clothing and bedding.
You might have candida or some fungal since that's what the mites feed on...
Coconut oil can be soothing to your skin and is good to combat fungal/candida problems.
Start taking probiotics if you're not already.
Sorry the professionals are having such a blind eye to your problem... it still blows my mind...