Can you cure my nausea?

I've recently started seeing a guy, and a nice one at that. We talk a lot and do loads of things together, and we've got plenty in common.

We love spending time with each other, we're both in agreement here :)

However:

When we're out to wine and dine I find that it's really difficult for me to eat. I have no issues with body image, I have a broad preference when it comes to food (I love it and normally eat loads) but I just can't figure out what's wrong. I get a nauseating feeling in the pit of my stomach but I try so hard to eat a good fill of food every time we go out -- it ain't easy.

Is it because I'm really into him? I feel great when I'm with him and I don't have any insecurities (that are out of the ordinary for most people).. Is there a way to remedy this -- I feel like I let us both down if I don't eat enough!