Hmm Stuff like that has happend to me too. I guess its not too much to worry about , i've had my period since i was about 10 yrs old, and every now and then i get it only every other month... weird(im not pregnant either or anything, because from what i know lol i've never had sex).. i still got the pms/cramps/back pains and stuff though like you say you do. Other than that it wasnt so bad. I would like to disown "aunt flow" but as nosey relatives usually do, she always comes back
Some of the girls in my class are having two periods/ month due to stress, but just thought I would tell you my story since you were asking.
OMG i cound NOT imagine that, my periods are bad enough as it is! Having 2 a month ugh
Actually its almost like i have 2 a month, i start getting "period symptoms" 2-3 wks before my period, and then on through my period so ugh Im not comfortable until its completley over, then i have maybe 2 weeks of peace, then im in pain again ugh. Im just going to get my breast, lower back, and uterus removed. See no more pain then!