anyone else been trying to get pregnant and this happens?

It's been one of those days where I want to curl up in my bed and hide from the world. Who else is with me here? My husband and I have been trying for 5 years now and yesterday we got yet another negative pregnancy test. I have come to the point that I don't want to even have sex anymore because I don't want to experience this pain every month. And to top it off, I work at a daycare in the infant room. Where all day I'm surrounded by babies. And today, one of my daycare babies had a shirt that says big sister and I'm supposed to be joyful. (Here goes another fake smile) Can anyone relate?