I thought I would give it a shot and ask you guys if you experienced something similar and found a solution 
Since I am a kid I have these headaches after/during sport. I get them easily when it’s hot and I overstrain and they do not stop after the effort. As a kid often and as an adult sometimes after football or something I even threw up 
I think it is not drinking since I get them during racing downhill in the summer too and there I focused a few times on drinking enough and regulary.
I always thought its overstraining but now when I do the base runs in the heat I even get them with 130bpm during the run. This really is annoying because I do not feel fatigue or something and still get them.
I can not really breath through my nose and was wondering if this can cause anything like this or you guys have any other ideas I could try?