Hello @babyy22, Welcome to Connect. I know it's especially difficult not being able to get answers when you are trying to help a loved one. Thank you for doing such a good job of documenting your father's struggle with his condition. I think this is really important and can be helpful when working with many different doctors over the years.

I'm sure you've done lots of research already in your search for answers. I thought I would share a couple of references in case you haven't seen them while we wait for other members who may have experience to respond.

"Swollen lymph glands are usually a sign of infection and tend to go down when you recover. However, they can sometimes have a more serious cause and may ..."
-- Swollen glands - Illnesses and conditions - NHS inform:
https://www.nhsinform.scot/illnesses-and-conditions/glands/swollen-glands.
-- Can Stress Cause Swollen Lymph Nodes?:
https://www.verywellhealth.com/can-stress-cause-swollen-lymph-nodes-5271651.
I know your father has seen many doctors and specialists over the years. Have you considered seeking help at a teaching hospital or major health facility like Mayo Clinic where a multidisciplanary teamwork approach is used for diagnosing and treating a patient?