Hi... Please understand this, Overthinking is a consequence and not a problem in itself. There are things you are seriously concerned about and since you are not thinking about them in your conscious mind so they are getting repressed, but still active, in your subconscious or unconscious mind. These repressed issues are at the core of your frustration, anxiety, and insomnia. Taking medication can only solve it temporarily. If you really want to resolve it, please undergo Counselling/Psychotherapy.
Next Steps
Consult a Psychologist and start taking Counselling Sessions on Weekly basis for 15-20 sessions minimum.
Health Tips
Mr. Gunjan Maithil
Senior Psychologist
Cell: Nine Six Seven One Three Zero Three One Three Four (whatsapp)
Website:https://gunjanmaithil.wixsite.com/therapy
App: http://wix.to/fECHB08?ref=cl