Running in the Heat

Last night, I had a really hot run on the schedule. It was about 96 +/- degrees. It was my first day of really training for a fast 5k later on in the year (after the Color Run in August). I have a route that is 3.16 miles and I wanted to see how I would normally run it without overly killing myself. 

Well, for the second day in a row, I had some pain under my jaw (shown in the picture) and it hurt when I would take in a deep breath, only while I ran. If I did my research correctly, it looks like it's the gland that makes saliva. My saliva is perfectly fine (even when I have this pain). It's not so bad, where I need to stop, but it causes some minor achiness. 

One thing that did cause me to stop was the fact that I did not freeze my hand held, like I have been. I had warm (aka tap) water while running and that was a major no-no. I think this caused me to have severe stomach cramps (when I shouldn't be having them). I had to stop and walk too many times. I hope things get better for tomorrows run. I think my body was in shock, because I got it use to the cooler temperatures and not running in hot weather, when I took last week off. The first thing I did when I got home was take off my shoes, and poured myself a huge glass of ice cold water and sat on the tile floor as my head stopped spinning.

All of these things need to stop, because I finally have a goal that I need to train for. My main goal is to run a 5k in under 30 minutes. I don't care if the official time is 29.59, I have met my goal with that time. So far, my best "official" time is 30.26. That is really good for me and I'm proud of that. Today's time was too embarrassing to even tell you. I'll give you a hint, it was something like 30% slower than that. 

Has anyone had of this stuff happen to them? Any unusual pains you've been having while running (or other forms of working out)? What's your 5k PR?