I Have A Constant Pain In My Right Groin Area

I have a constant pain in my right groin area which radiates to my inner tigh to my knee as a shooting pain. The groin is sensitive when I touch. This pain exists since 3 years. Over the years the pain has incrised and extended around my hip and lower back. My kidney, bowel, bladder ,ovaries basicaly everithing was checked ,but they could not find anything. I was only diagnosed with endometriosis at the beginning of these years. On an MRI 3 lymph nodes are visible (actually where the pain is comming from) all are around 10-12mm.
My question is that if these lymph nodes (or 1 of them) can cause the pain like pushing a nerve or something? How my groin can be examined to be able to know that the lymph nodes are ok and if any of them causing the pain? Is it possible to see if any of them effected by the endometriosis ?

Thank you for your answer,