Hi
Welcome to the MedHelp forum!
The scalp could be hurting because of dandruff, excessive dryness, eczema, dermatitis or even due to pinched nerves (less likely in your case). Thoroughly massage your scalp with warm oil, leave it overnight or for a few hours and use a mild shampoo with conditioner. Use tepid water for washing. If it does not help, consult a skin specialist.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
If i shower at night and let it air dry it is most painful*