frequent urination following period

[darkest-irony.livejournal.com]

i've been going through these phases for a few years where for about a week or so i would just pee a whole lot.  not only do i pee frequently, but every time i pee, there's a lot of it.  i've started to actually pay attention to when this does and doesn't happen.  so i figured out i always get these bouts of ridiculously frequent urination after my period ends.  i get really sweaty during this time as well.  i just want to know if this is normal or not, and if not, what the hell is wrong with me and what do i do about it?  any insight would be fantastic.  thanks :)