Seborrheic Dermatitis is caused by pathogens in the gut since the skin is a detox organ. your Seborrheic Dermatitis gets worse because you are attacking pathogens causes die off release through your skin. you should do Epsom Salt baths and sweat the die off out of the skin. your also getting headaches from the die off of pathogens/ parasites and bowel movements remove toxins thats why you feel better after the BM. your energy levels are low because your liver is working over time to clear out die off. u should include some high sulfur foods(broccoli cauliflower onion) or take glycine and taurine/cysteine to assist the liver pathways to eliminate all that die off. also, if your are getting angry and frustrated that is a sign of the liver working hard at detoxification. when the liver is stressed it causes anger issues.