Issues

I dont know what to do anymore. I have severe anxiety, chronic depression, bipolar disorder and PTSD. It all affect my life daily and I just don't know that to do anymore. Has anyone had/have these issues and know how to deal with them?? I'm 16 and it's been going on since I was 12. I've attempted suicide 5 times already and I'm really stuck in a rut. I'm engaged and I want to keep going for my fiancé, but things are so difficult