What symptoms do you experience when you have your period?

Obviously, this question is for ladies. ^.^ Don't worry, it's nothing gross. I always dislike it when that time of the month comes. It's very uncomfortable and sometimes, there are some uncomfortable or even painful symptoms. I remember my friend who always has very painful dysmenorrhea and she told me she really needs to sleep it off and she'd even cry it to sleep. Another person I know takes pain medications beforehand just to not feel the pain. As for me, I don't have dysmenorrhea but I do experience mild cramping sometimes. The symptoms I have during my period is that I don't have a lot of energy and I'll be really sleepy all day. As you know, we lose blood and blood carries the oxygen in our body. Also, I usually have debilitating headaches usually by the 3rd or 4th day. Even if I sleep it off, there's some residual headache and I still need to take pain medications. I'm just on my first day today and I can't wait for it to be over.