This has happened to me a few times. I know of alot of people who have had the same situation. With me, it's always been while hitting a bong. I'm not sure what it really is, I like to call it a thc overdose. I usually drink some cold fluids, get some fresh air, lay down. do whatever makes you feel better. It happens to every smoker from time to time. just try to take smaller hits. Don't let this ruin your smoking experiences.