I would think if he ate half of the car you would have seen it by now. I hope it's only 24 hour bug. It's really tough when our kids get sick, especially when they are young.
I hope the "little" man is feeling better so you can go. I think it would be really great for you guys. I've told you befor your H and I have some very similar traits. So heed this warning. We controling types like to have things go our way, we don't like last minute changes to our plans, for whatever reason. It makes us anxious and angry, we don't have control. I know, I know - we can't control everything in our lives, especially when a child is going to suddenly fall ill, but that's logical thinking. We're talking about the controlling personalities. We don't go with the flow too well, we can, but don't. So knowing all that, if H gets a little sullen, short or cranky over all this. Please, Please, Please - be patient with him. Not because he deserves it, but because that will be the best way to diffuse him. Agree with him, tell him it sucks, but if you don't feel comfortable leaving your baby tonight - don't.
Now if things don't work out how can you salvage the night? Put the kids to bed early. Get out your Korn CD's. Prepare some cocktails, nachos, fun foods. Turn your living room into a mosh pit, be silly together, but be together. You take it from there............ (This is just a quick off the wall suggestion)