Ugh..Please help I'm sick of SD!!

I have suffered from SD since i was 16,I'm 33 now.After many unsuccessful visits to the derm one finally told be I needed to try coal tar shampoo and it worked for over ten years.However recently I used a leave in conditioner that made me flair up and my beloved coal tar doesn't work anymore.I Have tried shampoo with tea tree oil and have treated a very flaky patch on the front of my scalp with pure tea tree and olive oil.I have long thick hair and that patch has suffered some hair lost(so i dont want to have to go that route again for the rest of my hair).I keep a pretty good diet with lotts of water,green tea,very little dairy or bread(only whole grain)ultimate 10 pro-biotic,1000 mg's and veggies however I do not eat any fish or take oil supps.I'm thinking of maybe some omega 3's and killing this slight chocolate habit I have been having lately(seems to get worse when I'm eating peanut butter cups).Any other suggestion in terms of over the counter shampoos for the scalp,or natural route?I was thinking Nizoral
Anti-Dandruff Shampoo??My face is under control..just my scalp is super itchy,white and flaky.thank u! Tweet