The feeling you get right after being separated from the person you love, such as through saying goodbye after spending the day or night together, especially when it was particularly romantic throughout, or at the end before leaving. You start to miss them horribly even though you were just together, and you can't think of anything but them, or focus on anything else but the
time you spent together. Zoning out, feeling
like there's a knot in your chest, being anxious, and generally being really
happy and/or
sad about both the time spent together and your not being with eachother like you were earlier are common symptoms.
To compare, it's
like literal drinking. After sixteen beers (or kissing, snuggling,
sex, or otherwise romance in general) you can't simply stop drinking and decide you're no longer
drunk, you
will still feel the affects of said drinking (or again, in this case, kissing, snuggling, etc.) and must slowly wind down from the earlier events.