F Labridor

I'm a brand new member and a bit lost in all the resources and information. I would appreciate any advice (or pointing me to a good reference.) Here's my situation: I'm 76 years old and a 27-year Army veteran. I served in Vietnam with an engineer land clearing battalion and was exposed to Agent Orange. When I retired in 1996 I was given a 20% rating due to skin issues including skin cancer. I had multiple sign cancers and Mohs surgeries afterward. Many years later I developed Non-Hodgkin Lymphoma, and the VA rated me at 100%. The decision letter said the evaluation was "not considered permanent" and would be reviewed after two years. I recently got a letter telling me I would be contacted to schedule an ACE Exam by telephone. I'm nervous about this obviously. My condition is stable, but I expect to see an oncologist for the rest of my life. Has anyone had a similar situation? Can anyone offer me advice going forward? Thanks very much!