> I believe the ghost of my dead father is haunting me, and my dog tells me the mail man is Satan.
Classic case of schizophrenia, better get you on heavy medication and see what we can do to counter the delusions.
> I think I'm invincible one day, then can't see why I should keep on living the next. Is this normal?
Sounds like you might be bi-polar. Let's analyze your mood swings and see if we can do something to regulate them.
> Doc, I can't seem to read properly. The letters just twist and turn and confuse me, it's really messing up my education and I've struggled my whole life with this. Is there anything you can do to help?
The letters aren't twisting or changing or trying to trick you, you just have dyslexia! This can often be cured by analyzing what type you have, and may be as easy as using a colored filter on whatever you read to correct the mistakes your mind is making.
> I believe I'm fat. Even though the scales say I weigh only 60 lbs, I just look at myself in the mirror and think I'm a bloated whale!
Ah, body dysmorphic disorder. Rare thing, but you're not fat, in fact you're incredibly under weight. We better put you on a specialized diet to get you health again and put you into treatment. Therapy and other treatment may help here.
> Doc, I'm a man but I think I'm a woman.
Wow, we better chop of your dick, fill you full of hormones, and do whatever we can to make your incorrect perception match reality ASAP! You understand this is extraordinarily painful, debilitating, costly, and irreversible right? Great, let's get started right away and, oh, you have insurance right? Awesome, let's start by splitting your penis in half.