Re: Should I pursue further testing...
Here's what I know: Bilirubin is a normal waste product that the liver is supposed to remove. Having too much of it could make you look jaundiced. Why could this happen? Probably lots of reasons, some bad, some minor.
If your red blood cells are kinda low, that would probably make you tired. Could be you need more iron.
I suspect that almost everybody, if given a full set of blood tests, would have a few questionable values. Still, you might want to mention this stuff when you go to the rheumatologist.