Your symptoms suggest seborrheic dermatitis (severe dandruff), which can inflame the scalp and lead to temporary hair loss. I recommend using an over-the-counter antifungal shampoo containing Ketoconazole or Zinc Pyrithione 2?3 times a week to treat the flakes. Once scalp inflammation settles, topical Minoxidil (5%) can help stimulate hair regrowth. Please avoid scratching and harsh styling products. Because severe hair loss can have multiple underlying causes, it is highly recommended to consult a dermatologist for a physical exam and a tailored treatment plan.