<human>: I'm in the delayed entry program for the USMC. We had a pt today which involved a short, two mile run at around a 6:30 minute mile pace. It wasn't much of a run, and i was fine during. I can easily run 8+miles,  and i currently have a 8:59 mile-and-a-half time. When we stopped running, we did some sprints. I started to (for the first time of running for over a year) get really lightheaded and dizzy, my vision was blurry, and it was like everything i saw was out of an overexposed camera lens (dilated pupils). This has not happened to me before, so i'm a little worried about it. 

Now, once we started running again, my head cleared right up, the dizzyness went away and things weren't overly bright. The same thing happened when we stopped running after that. In the midst of this i checked my pulse and it seemed really low after running as fast as we were. I am good at controlling my breath during running and have never felt short of breath while running (not seriously), and my pulse felt between 70-80 when i checked it. 

I was (at least i assume) hydrated, i had drinken nine glasses of water and two gatorades with good food earlier in the day. The previous night i drank about 11 oz. of liqour, which i would be suprised if that dehydrated me that badly. I didn't even have a hangover, lol. 

Any help would be greatly appreciated, or tell me which subreddit to go to. I ship out to boot camp in two days, and i really hope this won't become a recurring thing.

Can you give me the gist of the text in a nutshell?
<bot>: Good runner with a 6:00 mile ability out of breath, dizzy, dilated pupils after a two mile run, which cleared right up when he started running again. wondering why.