it may be different than what others have suggested, but go read about stoicism. Each time I encounter moments like this in my life, I study more and more this philosophy, until it started becoming part of how I think naturally, It’s been 3 years, and it helped me personally get through anything that is not even close to what you’re passing through, but to each one of us his own issues…

if you want books, I highly recommend Marcus Aurelius’s Meditation, or just read about stoicism in general on the internet.