getting a terrible headache after drinking while on your period?

I have noticed that whenever my mom is on her period and every once in a while she drinks a little bit too much wine, the next morning is hell for her; she would always tell me it's the "worst headache ever" while blaming herself because she drank while on her period. I never knew what it felt like or what she was going through until now. About 2 months ago I went out with my friends, while on my period, and drank heavily to celebrate my 21st bday. This was the first time I got drunk while on my period, although I have been drunk before. I got home around 2 a.m. and went to bed. In a few hours I woke up with a headache but not a terrible one so I was able to fall back asleep. I woke back up at around 8 a.m. with the most pain I've ever been in. I had the WORST headache ever, worse than a migraine. I literally wanted to take chunks of my head out where it was hurting lol. So basically I now know that I will be like my mom in this area so I am wondering if anyone else is like this or if anyone knows why this is. Thanks! :)