Lymph nodes? Infection?

Male (30) 4 weeks ago a lymph node appeared in my jaw which swelled my entire cheek, blood came back fine and doc said I had nothing to worry about. That night I began to run a mild fever and the lymph nodes in my groin, cheek, arm pits and behind my knees began to hurt. This ceased after 24 hours bar the groin pain. My lymph node in my jaw and swelling has reduced but I have begun to get swelling on the right side of my pubic bone, beside my penis. Urine sample has been tested but they are unsure what has caused the swelling. The pain runs from my hip across my lower abdomen, past the penis and down one side of the gluteus. Swelling is soft with no lumps and doc also think its is not due to a twisted testicle. Pain is concentrated 1 inch from penis, at a 10 o'clock position from docs view. Pain is worse when sitting which is hard as I work in a office. Please help