Never in the Mood

I've been dating my boyfriend for a little over a year now. We love each other a lot and overall have a really happy, healthy relationship. However, a couple months ago I started realizing that I was almost never in the mood for sex. And it's not that I'm not physically attracted to my boyfriend, because I definitely am. When all this first started, I was taking an antidepressant to deal with some anxiety issues. When I realized that my low sex drive could be a side effect of the antidepressant, I stopped taking it. I have been off it for a least a month now and I haven't noticed any significant improvement. This has been taking a toll on our relationship, I can tell it hurts his feelings when I reject him night after night and I feel like a failure knowing I am not taking care of him. Does anybody know what could be causing this? Or have any tips or home remedies for getting yourself in the mood?