How to permanently get rid of seborrheic dermatitis and demodex? (Photos)

I have been suffering with minor seb derm for 4 years and was recently diagnosed with demodex. I performed bloodwork which ruled out lupus. Its been so severe I have basically secluded myself from social activities. Im currently taking flagyl however i don't see a difference at 6 days. Im using tea tree oil and no steroids for the last 2 months. How can i permanently solve this issue? Is there laser treatment or anything else you can recommend in my case? I appreciate your help. Thanks