Meet Your Habenula: The Tiny Controller of Mental Health
Very good information on the habenula and it's behavioral effects.
Unfortunately none of the advice she is selling will actually lower the activity of your habenula.
Knowing what is going on is only half the battle. It solves very little of the actual symptoms. You can't think your way around that pathology, it's too deep in your brain stem. Trust me, you can't.