I go into a medically induced coma until the week is over! D: It all depends. Since I'm dating a guy and would like to not get pregnant, I'm on birth control pills ;_;! I just remind myself "better than a screaming child". Anyway, if I'm not feeling too great that month I'll just skip my period that month. Sure, it's nastier the next month, but at least I'm more emotionally prepared.
As for undies, the same I always wear. I wear my boxer briefs. It's weird, my boyfriend, my brother, and I all wear boxer briefs xD. Oh well, great minds think alike :'P. They're the most comfortable type for me in more ways than one. I am very obsessive compulsive regarding the tightness of my clothing. Pants must be loose, shirts depend on what I feel that day, underwear must be tight (and bras must be burned @_@...). If they're not right, then I ain't wearing them. Since I've gained weight (damn asthma meds!) I've gone pantsless most days unless I go out. Thankfully nobody cares if I walk around in my underwear and a t-shirt xD.
I recommend menstrual cups if you don't mind something inside you :'P. I don't have to deal with the bloody mess as often and they're more sanitary than pads and tampons. Great for someone who hemorrhages like I do since it catches more blood XP.