*mrsmopp"
A "palliative" course of treatment - be it chemotherapy or any other type - is simply a way to relieve symptoms of a disease without dealing with the cause.
As someone else said, it has now become synonymous with 'end of life' care - because the same treatment is used. It can, in some circumstances, also involve surgery.
If it's any comfort to you - I'm also on palliative care, for a condition that cannot be cured (intestinal failure) but which can be managed. During my course of treatments, I've also met others in the same boat (but for different reasons) who have been 'manged' for years and years.
Don't get yourself into a state of depression over this - it's a medical term. They are treating you by managing your condition. They are going to control the symptoms to give you a better quality of life.