OK I'm going to describe my last two periods and my history and see if anyone has any ideas.
Since I had kids my periods have been pretty painless and easy and I guess a normal flow, I did get some odd ones of course in the year after each birth. But the last two I've had have been strange. I normally get either pmt or cramps, not both, if I get pmt I know it'll be an easy one. But lately it's been absolutely no pmt, and much heavier cramping and a really heavy flow for the first 3 days then almost nothing. And this last one I felt really faint for a day and sick to the stomach. I also had more pale thready clots. (excuse the graphic desc). By day two though I felt ok.
Any ideas for me to think about? I really did feel off, I had to take into account too that the night before I had a phone call at 3am for FIL from the US so didn't get enough sleep but normally I'm fine after only one sleepless night- it would take few in a row to drag me down to feeling faint. oh and i'm not a "fainty" person, even when pg.
And I'm not pg...unless it was an immaculate conception....

so it's not an early miscarriage or anything.
Ta Em