Left sided abdominal discomfort

I’ve been feeling a consistent pressure on my left side (it moved from the lower quadrant to upper quadrant)

I went for an abdominal ultrasound & CT urogram. Nothing came back abnormal.

I’ve always had painful, heavy periods. No gyno has ever mentioned anything related to endometriosis.

Does anyone get this heavy pressure, like a balloon you want to pop in your side from endo?