I was diagnosed with an overactive thyroid when I was about 14 years old or so. I’m 39 now and I had the operation and RAI when I was 16. I do remember having swollen glands behind my ears and I think it was before I was diagnosed with the thyroid problem. My mother took me to the local doctor who just said it was swollen glands. I had the mumps when I was much younger so that was ruled out. I remember I looked like a pumpkin and it only lasted for a couple of days or so. I had forgotten all aboutit until I read your posting. I may have been on something to control my over active thyroid at the time. But most of that time is a blur to me so I can’t say for sure.
Just thought I’d let you know.