I had tender enlarged lymph nodes during and after Covid that would come and go. They finally settled down. I have had nothing like you have had. I would go back to the vascular doctor and ask for another ultrasound to be done and compare it to the previous one. I agree with you, it should have been explored further when you mentioned it 2 years ago.

My son was very prone to ear infections when he was little. One lymph node stayed enlarged behind his ear for a long time and the doctor said not to worry, it sometimes happens with infections. It stayed that way for years with him and it was very noticeable and large.

Praying for you.