Who can help me out!!!

Some nights when I’m asleep and then wake up in the morning I have these bad headaches. When I say bad they are terrible. Feels like my head is going to bust wide open. Okay so they only happen while I’m dreaming. And the. It’s crazy cause while I’m asleep and during the dream I know I’m dreaming. I probably be wording this horribly but I just wanna know why does my head hurt while I’m dreaming. And then I finally wake up the Lao lingers for about 5 minutes then go away. But I still have some pressure in my head. It’s so hard to explain this. Can someone please help me.