Thank you. I tend to be very cautious (in my old age) about medical treatments. I, too, sometimes go to a water aerobics class, I am happy there is one in my area. Just to let you know, where I was a teenager my mother sent me to a dermatologist because I had a little bit (not a lot) of acne. And he gave me that x-ray treatment, rotating an x-ray instrument all over my face. I had several treatments. I learned lately that is a indicator for greater chance of thyroid cancer later on. I also had many, many x-rays without protection for my teeth. Years ago they didn't use protective covering when taking x-rays of teeth. I will certainly let you know what the next doctor tells me. I will most likely allow the US exam for the nearby glands to be given to me, but I just wonder how dangerous those US scans are. I've had two already on my thyroid, and one iodine pill uptake.