i have suffered from this for as long as I can remember ............. Kerastase Anti-Dandruff shampoo used to work, and no longer does now. "Strong" shampoos such as head and shoulders or T-Gel make the problem a lot worse. I have recently been trying Liz earle's shampoo (which has no nasty chemicals) and have noticed a little improvement but not much. It is definitely linked to stress (having a horrible stressful time at the moment) ........... please please can someone recommend a shampoo/treatment that might work? My itchy scalp is driving me mad, and I am fed up seeing flakes in my hair and on my clothes -sorry, so gross.