Anyone else suffer from a headache after an intense run? I can understand when I get them in the heat, like after my 10k in September, but I was in the gym today. It did feel warm (and my friend agreed), probably because it got up to 55* today, but it wasn't THAT warm. I did an interval run, alternating between 6.5 and 7 for .25 miles each. In fact, last week I was able to run .5 miles at 7 and then run .25 at 6.5. I missed my long run on Saturday because of the weather. Maybe that's why I felt like complete and utter roadkill after a 45 minute run?? I managed to get in 4.87 miles in 47 minutes with warm-up and cool down.