i've had increasingly painful menstrual cycles since last july (2008). now, in the last two months my cycles, while still regular as they always were, are now lasting longer. the one last month lasted 13 days. the month before that was about 10 days. my doctor has taken samples to send off for testing. however, this week is my cycle, & i'm now noticing a strange colored stool (sorry, so graphic). at first i thought it was like that b/c i didn't really eat anything the first time it happened..but, this last time, i had a full meal & it still looked the same. it's very sparse stool (despite my big meal) & it's a grayish looking color (is the best i can describe it). do these symptoms sound like that of a particular disorder?..b/c what i've read on endometriosis so far makes no mention of discolored, strange textured stool. thanks, in advance.