Libido

So, I've been struggling with my sex drive for a WHILE. I'm having a hard time getting turned on and actually WANTING sex. At this rate, my husband and I have sex ABOUT once a month. My OB says on average, couples have sex about once a week. We've tried changing my birth control a hundred times, I've cut things out to reduce stress, we've made more time for general romance together. Nothing seems to help. What can I do to increase my sex drive so that my husband and I can do it more, and I can actually WANT it? Has anyone else ever struggled with this? I feel like I'm broken.