I remember those mad crush, can't-eat-can't-sleep things. I also remember the best way to cope with them is to wait them out if it was one of those stupid things when the crush didn't know I existed and wouldn't appreciate being reminded that I did. Eventually he'd do something awful enough to bust my bubble and I'd get back to normal.
If he did know me, then getting closer was a sure fired cure. (yes, I'm a cynic, why do you ask?) The one time it didn't go away, I ended up marrying him.
You might find that 25 mg. of benadryl at night will help your sleeping a lot more than valerian root does. It's one of those good drugs to keep around in any case, just in case you get poison ivy or hives as well as love sickness. You can also consider melatonin, a natural hormone. It's over the counter. A quarter of a tab does me, natural amounts in our bodies are measured in micrograms, not milligrams. Neither of these things will hurt you in any way.
The treatment for that upset stomach is small, frequent meals. You're already doing the right thing of not turning to junk food. You'll be eating a bit less for the duration, so you'll want to make it as high quality as possible.
Also realize whether or not this turns out to be a mutual thing, the emotional rollercoaster, anorexia and insomnia will fade. Our bodies are designed to make us asses over each other, not to starve us to death over it.
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