How to find reasons to keep going

I have been doing really terribly over the past year, it’s been the worst year of my life and I can confidently say that. My best friend was abusing me emotionally and mentally and went off the deep end after moving in with me, I got h. Pylori and didn’t get diagnosed or treated until well into the infection, my ex best friend moves out during the treatment for this and makes my life a living hell, a relationship I shouldn’t have been in ended and I ended up going a little bat shit crazy, my dog died, my roommates/friends are growing tired of me and have even dropped me or are moving out early. I was in a weird throuple thing that ended during my best friend moving out and I really wish I never went into that relationship, I’m a lot happier in a monogamous relationship. I digress, my reactions and mental illnesses are truly out of control, I ended up breaking a glass when I threw it at the ground out of anger (which I shouldn’t have done, I feel like the worst person in the world for doing that, thank god no one else was home). I truly am just at my lowest and I need to find a way to keep going without feeling like the walls are closing in on me, I’m scared and really unsure of what to do. I just turned 22 and I need to know that, idk I’m not alone and that there can be more to this. I’m sorry for formatting and rambling, I can explain more if need be.