Head throbbing after a vigorous workout?

Im a 14 year old girl, and i just finished the 8th grade and im going into freshman year. Im in Marching band practice all summer, and to all you band geeks out there, you all know how hard the Marching Units work and practice. I had a full day of practice, 9 am to 6 pm. We jogged in the morning for PT (physical training) and i got tired halfway due to my asthma. We jogged again as a "game", and we jogged again because our Marching Director said we werent staying pumped enough to get the exercise right. But when we had lunch and a water break, my head has been throbbing the whole time and when i went home, and even now. Its been a pretty hot and humid day so could it be from the heat? Or is this normal? This has never happened to me jogging during regular school gym