I sing for a band called Thin, and we’re making our first album right now. I’ve been singing and practicing every day for a little over a year now and I’ve always had minor head aches while singing. I have a deep voice so I’ve been trying to get my voice higher by hitting notes that are out of my range. My range is pretty wide now and I don’t have trouble hitting them anymore, but when I do I get pretty bad headaches that last for about 30 seconds and then go away. If I sing like this for about 2-3 hours, the headache doesn’t go away until the next day… I can naturally strain so I don’t think that’s the issue, it’s usually just clean, high notes that make them start. Just wondering if anyone else here sings that much and has that problem or if anyone knows why this is happening. Thanks for the movie suggestions by the way guys 
Are you on any meds that make you sensitive to sound?
Risperidone and prazosin. I had headaches before I started taking them though
Found this answer seems to be the most common cause for headaches while singing…
What you are doing is called “restricted breathing”. What that means is, you’re not using proper breathing technique. When you’re breathing in, it sounds like your breathing through your chest. When you are singing, you are not letting all the breath inside of you out after you breathe in. What happens you do that is creates a whole lot of carbon dioxide in your body, if you keep carbon dioxide in your body, you can’t get oxygen in which allows your brain to operate right. Since your head is full of carbon dioxide since your not letting out, your head get’s stressed, which creates the headache/light head problem. What you need to do is look up some videos about breathing technique. Because if you keep breathing like this, you’re going to Ruin your vocal chords.
Thank you so much
I hope it helps and good luck to you and your group…
Have you heard of head voice vs chest voice? My vocal teacher used to blast us about it. When you breath while singing your entire diaphragm including your stomach should expand but when we attempt high notes, we tend to take shallower breaths and hit it with our ‘head voice’. If you’re doing that a lot, you aren’t getting enough oxygen to your brain and you’re also straining your throat and vocal chords.