Ladies I need some womanly advice

So I came home may 5th and went to the doctor they ran urine and asked me if I had symptoms of a UTI I didn’t so I said no. My back wasn’t hurting and it didn’t hurt to pee. They ran some more urine test a week later asked the same thing said no they asked me to come back in four days asked me again I still had no symptoms so they just left it alone. Well June 9 or 10th I got a swollen lymph node in my groin it doesn’t hurt I can forget it was even there. On July 22 I got a full panel STD test everything came back negative and my urine still was saying it has some possible contamination but after two days it didn’t grow anymore. They want to have surgery to remove my lymph node but never gave me any antibiotics to see if it would go down just in case I did have a UTI. So I went on a one day water fast and my lymph node obviously shrunk so I called them and asked could I get treated for a UTI and I’m waiting for them to call me back. Am I wrong for wanted to know for sure before they cut me open especially if they really didn’t even try anything to see if it would go down.