Is there a cure or clarification for the problem of madhy (pre-seminal fluid) discharge during sleep and the psychological distress it causes?

There is no need to be distressed by the emission of this discharge; it is something Allah has decreed for you, and you are not accountable for it. If the discharge is semen (maniyy), perform ghusl (definition). If it is pre-seminal fluid (madhiy), remove the discharge and perform wudu'. There is no further obligation upon you. Seek Allah's help and supplicate Him to relieve you of it. You may also consult doctors if it has an organic cause.