Two PM and you haven't eaten? Then you smoke pot? What do you expect? I'm not going to get into the pot thing, my own opinion is that it just makes more of what you are already. If it doesn't do good things for you, don't smoke it. But you sound more to me like you're not eating right, and have a blood sugar problem. Not that anyone here can diagnose you from a distance, but the eating problems of cheerleaders isn't exactly a well-kept secret. When you work out, you need electrolytes, protein, a good balance of carbohydrates, that in combination help build muscle, energy to burn, and endurance. If you don't have that balance because you're not eating well, you will feel it, and not for the good.
Oddly, this happened to me when I was 17 too. Smoking with friends and suddenly felt dizzy and blacked out. It was a one time thing. I continued to smoke for many years which was one of the worst decisions I have ever made.
Put the word "marijuana" up in "Search this Community" and read some old posts on the reactions of pot smoking. You had a bad reaction which should be a wake up call for you.
Please don't smoke anymore. It is possible for pot to bring on permanent anxiety and believe me, you don't want to live that way.
You might get better answers in the drug abuse forum here on MedHelp. From others who have smoked the same muck.