For the past 6 months, my periods have changed. I am 32 years old. I will spot for 3-4 days, then begin my heavy period for 5-7 day. I used to run like clockwork for 5 days. Now, during my period, bloodflow will stop, and I feel "stopped up." (This is the only way I know how to describe it.) In a few hours, I feel a "pop." A clot has passed. Sometimes, my period resumes. Other times, I am stopped up again. I will again pass a huge clot. (golf ball size or larger). It makes such a mess! Any ideas?