Depression, anxiety, and insomnia. How would i let BH health know how hard it is for me to perform my military duties everyday?

I feel like I’m not getting anywhere with my depression and anxiety and with everything that has happened over the last few years while in service has really taken a toll mentally on me, I have been seeing BH but they keep saying I’ll get better. But i feel like the longer that I’m in the worse it’ll get just not happy with anything anymore. I can’t request to get a chapter 5-17. Idk what else to do.