He is in the state of depression. this is spiritual and mental problem rather than physical problem according to me. A person goes in depression if the surroundings are not religious. anyways I suggest you can send him to a place far from home for few days and inshaAllah he will benefit.
in any case I suggest do never put any pressure on him whatsoever. Talk gently with him Pray from Allah. May allah give him shifa. Ameen.
Also Try to disconnect him from his colony where he lives and anything he is related to for few days. send him for Hajj (preferebely) or Umrah and I believe he will be a different person inshaAllah.
May Allah Give Shifa to this patient. He is suffering with Waswasah & whispering of Sheytaan.
Hijamah on the head is beneficial, furthermore, he needs cure from RUQYA & Sadaqah.
Following articles will help further Insha'Allah.
Sufoof-e-shifa is a remarkable anti-stress herbal medicine that provides the following benefits:
Improves memory and mental ability
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Maintains calm during stressful conditions
Effectively combats all forms of stress and promotes sleep and quality of sleep