According to your history, looks like you have seborrheic eczema.. ie dandruff
over scalp associated with seborrheic lesiong over face and body
(also known as "seborrheic eczema" )is an inflammatory skin disorderaffecting the scalp, face, and torso. Typically, seborrheic dermatitis presents with scaly, flaky, itchy, and red skin. It particularly affects the sebaceous-gland-rich areas of skin. In adolescents and adults, seborrhoeic dermatitis usually presents as scalp scaling similar to dandruff or as mild to marked erythema of the nasolabial fold
Dermatologists recommend topical treatments such as shampoos, cleansers or creams/lotions that contain antifungal, anti-inflammatory, sebo-suppressive or keratolytic
ingredients:One combination approach combines a dandruff shampoo, antifungal agent and topical steroid
For the itching, you should take some antihistamines like levocetrizine...
Hope it helps
Dr Geetika Paul