What should I do for pain in groin and activity restriction?

Hi doctor,

I have had mild right-side groin pain for about two years, making it very difficult to run. One morning, I woke up unable to use my right leg because of the severity of the pain. I was very active then, so I assumed it was a sprain in or around the groin. The pain got better about a week later, but I felt pain whenever I tried to run. Recently, I suffered from some kind of undiagnosed burning during urination, right-side testicle pain, and groin pain, even though my blood work and urine test came back fine. The burning and testicle pain has subsided, but the groin pain has stayed and intensified compared to the prior infection. I was sent in for an ultrasound, and my doctor said everything was fine. I told him that I was sure my groin lymph nodes were mildly swollen. He touched the area and said I was fine. I am not a thin guy and have a bit of fat in that area, so I think he had trouble feeling them. I still feel mildly swollen lymph nodes in my right side groin, and I still have pain when I attempt to run. I believe my lymph nodes have been the root of all my pain, but I cannot seem to get the doctor to believe me. I looked at a diagram of groin lymph nodes, where I felt pain and mild swelling. What should I do? I am lost. Please guide me.