Very painfull and heavy periods and i am 31 years old?

i have painfull bowel movements when i am on my periods. my periods are veary heavy and painful , i go to the toilet after every 30 to 45 mins. i use a tampoon together with a pad to stop spoiling my clothes , ive tried the mefanamic acid and is not working my doctor said i should wait for the pelvic ultrasound scan in august. pliz if there is anyone who knows what i can use btwn now and aug pliz help