Hi Anon,
Welcome to the "Board". You should definately got to the Dr. I suffered with terrible, heavy abnormal bleeding with heavy clotting and
extreme abdominal pain to where I could barely walk and I suffered that way for
5 months before going to the Dr. (Only out ouf stubborness and disliking my OBGYN and taking time off work~my employers hate that!) So they initially thought that I had Endometrial Cancer. But after having (3) of those biopsies and I am sure there will be more...I have Uterine fibroids and ovarian cysts and an enlarged endometrium. And believe me, the fibroids make your periods hurt like heck!! It is NO day in the park!! I am going through it right now and even my strong pain meds for my back do not take away this pain! It is horrible and I have to work with this pain, I wish I was in bed with my heating pad.....
Anyway Miss Anon, please whenever your periods change you should see your OBGYN or GYN, depending. It could be caused by stress, by changes in your diet or exercise (too much/too little), and other hormonal changes (thyroid issues, obesity~ all of that can cause problems with your periods) They say that when you periods are healthy, YOU are healthy. So I guess that means I am NOT healthy. Well, at least I have the other things in life like love and happiness!

There is always a bright side to everything!
Take care and please keep me posted, and please go to the dr. Please........
Good luck