I have had this issue for so many reasons.
-anxiety
-stress
-birth control
-antidepressant
you name it, it affects my libido
It is hard because he naturally has a higher sex drive than me and then when mine gets lowered farther...
Sometimes I've had some luck if I mentally work on it. Pretend like I am in the mood and eventually sometimes it becomes real. Like when you fake a smile and eventually you realize that it's real.