I'm 17 & I've been having my period for over 4 years now, they've always been very regular (coming every 26 to 30 days) & not very painful. Around February they started coming late, I didn't even have one for the month of April, & being a little heavier. In March I had back pain so bad I had to go to the ER because we thought I had a kidney infection. Now, I'm having stomach, lower back, and pelvic cramps all the time. I'm also nauseous a lot and I've been having thicker & stickier discharge. My grandma had endometriosis so bad she had to get a total historectomy, could I have it? Should I go to the doctor??