I would like to tell you that seasonal variations are also aggravating factors for such problems..there are ways to keep your disease under control only by using certain topical treatment..Ask your dermatologist for that..

Dandruff is a common situation more common among teenagers. It can be more problematic if you are using hair oils. So consider discontinuation of oils and using an antifungal shampoo everyday for first week and then reduce the application to twice a week for maintenance. You should keep the shampoo at-least for 5 minutes on the scalp for it to act. This should solve your problem. However if problem persists, consult a Dermatologist for proper diagnosis and treatment and to rule out any other skin condition. Hope it helps you.

Besides all routine medicines, your diet,stress and hormonal issues play a big role on sebhoreic Dermatitis, Have a low glycemic index diet, and is best to discuss In Detail over physical consult or phone. It needs holistic management. S.d and hair loss is just a symptom in my opinion. Your food is a big culprit, sometimes milk and dairy may play a role.