Denied Life Insurance

I got a letter today informing me that I've been denied coverage for life insurance.  I guess I shouldn't be too surprised, and "brain tumor" seems to ring some alarm bells.  Still, it's utterly frustrating.  I don't think they took a serious look at my prolactinoma (<5 mm) or my medical history, or they would have realized that it is absolutely not life threatening.  I've lived with it for 14 yrs without any change in size or symptoms!  I'm actually a very healthy person, eat well, exercise regularly, don't drink/smoke/do drugs.  I don't even drive very often, which is major risk factor!  I'm frustrated by these "ancillary" side effects of my tumor.