How long have you been trying?
TTC gets more emotional for women than for men, for the most part. If you've been trying less than a year, you need to calm down. It takes most couples an AVERAGE of a year to conceive--there's nothing wrong, and you need to stop focusing on it. Period. I know it's hard to NOT look at the pink elephant in the living room when someone tells you not to, but seriously--teach your mind to think of something else EVERY time you think of getting pregnant (or not getting pregnant). I taught myself to start thinking about dinner every time I started stressing about pregnancy.
If it's been LONGER than a year, you need to go to your doctor--BOTH of you. You may also benefit from talking to a counselor or pastor about your feelings--your husband, frankly, doesn't want to hear it. He's not responsible for your happiness, and if you're crying and/or being upset for more days in the month than just the first day of your period (which it's understandable to be sad on) then you NEED to see a counselor.
If you're focusing that much on it, and getting that upset--that emotional uproar is probably what is preventing the pregnancy to begin with. You need to relax about it, and stop thinking about sex as being the key to pregnancy, but that sex is a way to connect with your husband. FIND ways to connect with him, and STOP thinking about having a baby all the time.