I need answers...Biopsy? Endometriosis?...Help

I’ve had extremely severe cramps for as long as I can remember...sweating, nausea, radiating pain down my legs. My doctor has sent me for a few ultrasounds over the years, I’ve had ovarian cysts, but generally blown off and told to go on birth control to help with cramps. I’ve also had painful sex on and off, but consistently for at least the last 3 years.

I had a baby via c-section 21 months ago and have had extremely heavy bleeding with clots ever since, with (weird) spotting between periods...what seems like constantly and always during ovulation.

I went to the doctor Monday (not my normal GYN, another doctor from the same practice) and she said it’s most likely endometriosis, and my doctor just hadn’t “connected the dots”. She said the only treatment is birth control (and they don’t do laparoscopy to diagnose because it doesn’t change treatment), which I don’t want to do because I’d like to get pregnant within the next year. The other option she gave me was to have a uterine biopsy to “rule out” uterine cancer, which would be the only other explanation. She said I don’t fit the profile and am not high risk, but she’ll do it if I am “that worried”. Also, endometriosis doesn’t explain the heavy abnormal bleeding, apparently?

Anyone have a similar experience or any advice? I’m really torn about the biopsy or what to do from here. I am so sick of having no answers.