Doesn't sound like any mental illness I am familiar with. Painful yes but not what I would describe as being on the spectrum of mental illnesses.

If you truly feel this individual is ill then a visit to their family doctor is in order. If the family doctor feels a referral is in order they will make one to a psychiatrist. What they should NOT be doing is attempting to self diagnose. This is NEVER a good idea. Offer this person support and encouragement to pursue this if they are truly concerned something is wrong.