I think I've posted about this before. I had some pain in my right testicle, and ignored it with Tylenol for more than a week. It got to the point where it had swollen to the size of an orange, and I could barely walk. I went to see a doctor, and he immediately send me to a urologist. That was the scary part. He took one look, and said, "we're calling the urologist. Go directly there. You have an appointment in 20 minutes."
The urologist couldn't figure out what was going on, so he put me on an antibiotic and ordered an ultrasound.
The tech took me back. The changing rooms were across the hall from the procedure rooms. She showed me to a cubicle, and told me to take everything off from the waist down, and put on a gown. All of the gowns were enormous on me, because they mostly did pregnancy ultrasounds. She told me after I was changed to come across the hall, which I did. I sat on the table. She took a hand towel and folded it lengthwise twice, so it was a strip of towel about four inches wide and maybe two feet wide. She told me to lay down with my penis pointing up, put the towel across my penis to hold it in place, and then tuck it under me on the sides. She also gave me a sheet to cover up, and left the room.
I prepared myself, and when she came back in, she rolled up another towel and placed the rolled towel vertically between my legs under my balls. I think that was mostly to catch any gel that might leak down. She did the ultrasound, and was very professional about it. There was no pain beyond the pain I was already in, the gel was warm, and she let me watch on the screen as she did it.
At one point, she kept lingering and rechecking things, and then told me to hold on. She left the room and came back with another woman. This one was older and clearly more experienced. She took the wand and rechecked some parts. Then she told me I could clean myself up with the towels and get dressed. They both left the room at that point.
The urologist diagnosed it as an infection, but a later urologist said it was probably torsion. It could have been easily treated if I had gone in sooner, but I waited too long.