(Disclaimer: I am not a doctor and none of this is meant to provide medical advice. This is just my personal experience.)
I struggle with being my own patient advocate and not being a hypochondriac. I know that having OCD means that I have a tendency to catastrophize and this includes imagining worst-case possible illnesses or medical situations. I know when I’m at my most mentally ill that I can see an aneurysm instead of a migraine or some other catastrophic illness in a simple flu or cold.