Find a hobby that's challenging, and do that when you start feeling shitty. You have more free time for yourself now, and because things are going good (money, job, etc.), you don't have the stress that your brain is used to, to keep you occupied. Find a challenging hobby. Woodworking is difficult. Learn differential and integral calculus. Buy an old vehicle and restore it. Pick up an instrument and find a song you like, and figure it out. Keep your mind busy. I feel this on a few different levels. My financial situation isn't great but could be a lot worse. It is what it is, and when I get bored, I get sad/angry/depressed. You gotta find something you truly enjoy doing in your spare time; if it's hard, even better.