What does Endometriosis pain feel like?

I went to the doctor a few months ago because of terrible pelvis pain. She said I may have endo. However, I’m only 20 and she didn’t seem too concerned with me going to a gynecologist. I get random pelvic pain. My body gets warm and I feel like I’m going to pass out. My pain is in the middle of my pelvis and goes on the left side. Starts right below my boobs and goes to about my hip bone. The pain feels like something in my stomach is about to explode. The pain is so bad I just want to scream. The pain gets worse and worse every time it comes on. Does anyone else experience this?