I've been told that I have a bicornuate uterus with a septum attatched (currently waiting to get this removed) and also spots of endo have been found. Im waiting on op to get this removed also. I exercise regularly and since coming off the pill (3 years ago) I have period like pains when I do exercise, particularly when I run. This has been bearable and not a problem, however recently it has started getting really bad, I did a run the other day and couldnt stand up afterwards because the pain was so bad, I get bad period pains anyway but this felt like the most excruciating period pain i've ever had. It lasted about 20 minutes of me being crumpled up on the floor. It subsided after this, however im worried about it. Has anyone ever experienced this, and if so have an idea why it happens and what can be done to prevent it? (Besides not exercising!) thanks.