Some people just get like that when they're high. I've felt like that, but not THAT severe. My cousin has a bad experience every time, so she prefers not to smoke now. You may want to do the same if this is a regular occurence. If not, then try to remember that it's all in your mind. Marijuana creates paranoia in most inexperienced smokers, after smoking a while, you will overcome the paranoia. It's all in the mind friend.
Also, I tell beginners to PACE themselves. Smoke slowly, inhale slowly, and exhale slowly. This way, as you get high, it won't all hit you at once.