I feel unattractive...

I've been wanting my husband like crazy today and yesterday. But, when I ask him if we can have sex, he says not really... He used to jump to the question with a yes. Now, he seems uninterested with me. He barely seems to be affectionate lately also. It's making me feel really shitty about myself. When I try to talk to him about it, he acts like I'm being silly and just says that he's not feeling it. I ask him why and then he gets irritated with me and says "what? I can't just not feel like it some times? You don't feel like doing sometimes either". Which I barely never feel like having sex. I am a nympho, he should know this. Then when I make this known, he makes me feel like shit by saying " so sex is the only thing that matters?" . So then I feel like I'm a sex maniac and that I'm a lacking wife otherwise... I don't know what happened and what made that sexual spark leave. Any advice ladies?