@msherfinski, I have lymphedema in my legs but had not read about it being in the head and neck. Here's some information I found that includes a self massage video tutorial.

Patient Guide: Head and Neck Lymphedema following Cancer Treatment: https://torontophysiotherapy.ca/head-and-neck-lymphedema-following-cancer-treatment/

Are you able to share an update with us after you meet with the Lymphedema Specialist?