Hi!there are otc shampoo available for dandruff which would give you some relief but if it still persists,better to se your dermatologist.

Severe dandruff could indicate dandruff itself which is significant or can indicate beginning of some other skin condition like Seborrheic dermatitis or Scalp psoriasis. Based on your description of pain on the scalp it looks like a superficial bacterial infection usually caused by staphylococcus aureus. Sometimes they co-exist with fungal folliculitis and can be determined with more precision during a consultation.