Anger issues?

I was in a relationship where I thought so highly of this man, always supported him and his dreams never took him for granted, I thought we were on the same until he cheated on me and ever since then I’m not the same happy girl I once was I lost myself.

It’s been a year and I’m just so angry at the world, constantly having anxiety attacks. Hating everyone and the world. Idk what to do anymore, I feel like I’m going insane.