Can I avoid these headaches?

This question is for anyone, but especially singers.. I put my all into performances, and belting out powerful and high notes always leaves my head pounding. Is this normal? Is this something serious? Can I avoid this? I know it may seem trivial but the frequency of these headaches have increased dramatically and I am wondering if this is a preset to something bigger to be concerned about. I have never had a migraine, but the pain when I calm down from these shows on a scale from one to ten feels like nine. Serious question, any input would be greatly appreciated.