What are the symptoms of severe endometriosis?

My doctor thinks I have endometriosis because my period is irregular, painful, and I have been trying to get pregnant for 4 years and no luck. I had a pelvic exam done on Jan. 19th, and i was very tender up in there, and my period came on Feb 7th and it hurt so bad, nothing would stop the pain. I have never hurt that bad in my life. My back and pelvis was hurting terrible too. Do you think I have stage 4 endometriosis?