Yes. Thank you. It seems from all the posts that this is a common inconvenience for active women -- and quite the disappointment since we are often told that exercise helps with cramps.
Indeed when I go for a run about a week before my period begins, I too suffer about 2 miles in from debilitating pains. I can feel it begin to ache and think, "uh oh here is comes, better stop soon before I make it worse." Without fail, I have to roll down my running pants to remove ANY pressure from my abdomen and cannot so much as muster a hello to passersby ...YES the pain is THAT TERRIBLE.
I have tried to walk (crawl?) it off, but the best thing to do is to sit down and grit your teeth...
after about 10 minutes of what makes death feel like a desirable alternative, all pain will subside and you can continue on your run (even though you have promised yourself that you won't run for another 10 yrs. and also the heavenly bodies above that you will give up all vices should someone miraculously remove the pain).
I get very severe cramps (starting 4 or so yrs. into having a period -- where before I never even knew the feeling...sigh). I find that it helps to drink a glass of wine/have a beer (relaxes muscles), put your warm laptop on your abdomen (I know, it sounds silly, but all things silly are disregarded if you know the feeling of awful cramps), and if you should feel so obliged, have an ******

-- it is the cure all to hanfover headaches and cramps...I kid you not. ha.
Good luck finding tricks, as I know I will keep searching to cure the running pains!!!