Uncontrollable shaking?

I haven't had much relationship experience in the past but now that I've come to college I figured that it was time to take a chance and I ended up liking this guy who I found out liked me. We haven't done much but just cuddled but since everything started I've been feeling a lot of uncontrollable anxiety such as shaking and a racing heart even hours after everything occurred. I feel sick and don't know whether i'm hungry or full and feel really jittery. Has this ever happened to anyone and does anyone have any advice? I'm against taking medication for anxiety and such and i've never had a problem with it before but if anyone had any tips to calm down that would be great.