Have you started any new medications lately? Sometimes my birth control messes with my mood. Also it could just be how you feel about him lately, maybe you need to connect with him again. Plan a nice evening, go out to dinner (if you have kids send them to grandmas), have a date night again. Maybe you're just getting caught up in work and life and when women get stressed out we push sex out of our mind. The brain is the most important sex organ so just relax and dedicate an evening to being together, and don't put any pressure on by thinking "I have to have sex tonight" just let things happen as they do.

I know how you feel. It comes and goes with me though, I am either raging or not horny at all (and the times are not working well with his work schedule) I find myself giving him alot of blowjobs lately.

How is your sleep?
If you aren't getting enough then this could be a main part of the problem. You would be surprised at how many things inadequate sleep can cause.

Also, as mentioned before, stress is a big passion killer:/