the cancer cells get into the marrow, multiply and crowd out the good platelet-producing cells. Low
platelets leads to easy bruising/bleeding. So your cause
is something different.
I would have suggested Chronic Fatigue Syndrome, which produces many effects that you have, and all can be created by immune system reactions. CFS + neurological symptoms would be M.E. (Myalgic Encephalomyelitis) But then again, you do have chronically elevated neutrophils, which is not a feature of CFS.