I am a 42 old male, I go to the gym 3 times a week lifting weights, I have a good healthy diet. Although I normally breath correctley when training, if I do hold my breath for that bit extra push my head hurts like hell. My head is aching very slightly now, I only get headaches 2 times a year and nurofen cures this within half an hour. My cyanoses seem fine and I don't suffer with hayfever.