Tonight I completed W8R1 (yay!) but have noticed that this evening, and after the last run I did, I've been feeling headachey and a bit under the weather a few hours later - enough to notice. My recovery period is also longer - I left a two day rest period this week because my calves were hurting so much. I don't like running in the heat. Does anyone else find this with the longer runs? Is it my body adjusting to running further, or am I getting heat stroke?! I sometimes find it difficult to know if I am facing a mental barrier or should listen to my body.