I can't get aroused. Any advice?!

I love sex, I really love it but for quite some time now I haven't been able to get aroused. Sex even with lube doesn't get me aroused. Sex often hurts and I'd pretty much rather not do it. I'm with a wonderful man but I think he feels like I don't want to do it which is so far from the truth. I'm 30 years old and I feel like I should be in my sexual prime but I'm not and it's depressing. Even porn, erotica, vibrators and touching myself doesn't seem to work. Any suggestions are appreciated.

Thanks and no rude answers.