I have lymphedema in my neck and face and am 9 months out from finishing treatments. I went to see a PT who massaged and trained me with massage. She also helped me find a collar to order as my shitty insurance, aetna, wouldn't pay for a custom one. I think if I had that, things would be better. The one I bought from amazon comes off every night while I sleep so benefits are null there.
The massage and stretching I do every morning and sometimes through out the day as it builds up. I take a shower in the AM and go through the regiment, I am sorry if I skip this. If it gets bad, I can feel it closing around my throat, it feels chokey and painful. Some days are worse than others and I think diet as well as exercise makes a difference. I have some saliva back, that's pretty exciting. PM me so I see it if you want me to go through the steps of the massage.
Get in to see a PT asap that knows the techniques because everyone is different.