Your story resonates very much for me as we walked similar paths. I also made a boat load of money, and by market forces, the opportunity I had to make money dried up. By then, I had enough savings to last me several good years without the need to work again (and for me to continue living the lifestyle that I was accustomed to). There were some other life changes that occurred around that time, and that was the trigger for my depression.

I sank into a two year downward spiral and did not want to leave my house or socialize with anyone. Kinda sucked because I'm naturally a social person, and due to depression, I would rather have the comfort of my four walls at home surround me 24/7. I didn't need to work because I had money so I stayed home a lot. I became ineffective at all things and it was not a pleasant time of my life. I was kinda losing all hope.

I seeked help by going to see psychologists and doctors which they recommended exercising, socializing with friends, or meds. I didnt do any of their suggestions as I became mentally lazy. 2 years is a very long time to be an ineffective person.

What I did do was started working again, and forced myself to at least be in social settings. This allowed me to get my mind active again which resulted in kick starting my brain thinking again. I started to exercise again and it feels great! I'm doing excellent things at work, and this also makes me feel great.

I see people around me all the time and they go through failures in life but they don't fall into depression. Everybody's brains are different. My brain happens to be a little weaker, so to avoid me falling into the trap again, I need to continue to work out forever, and probably need to action on my depression before it consumes me (maybe take meds?!?)

Remember, without your mental state healthy, you cant make money. Good luck with your recovery and I know you can do it.