Is marital/relationship counseling available, on base? Maybe that combined with a little individual counseling, to help you with the darker thoughts that you have. Have you been overseas, before; asking if that may contribute?
We all bring our own pains to whatever relationships we are in. And it's good to see your desire to face your own.
Has she been hesitant about coming with you? It's not an easy life, but I hope you find the stability and peace in your relationship that you deserve. Your daughter will grow up knowing that both her parents gave it a chance!