Doctor doctor 04

Doctor Doctor I feel like a racehorse.
Take one of these every 4 laps!

Doctor, doctor my sister here keeps thinking she's invisible!
What sister?

Doctor, Doctor I'm on a diet and it's making me irritable. Yesterday I bit someones ear off.
Oh dear, that's a lot of calories!

Doctor, Doctor Can I have second opinion?
Of course, come back tomorrow!

Doctor, Doctor you have to help me out!
Certainly, which way did you come in?

Doctor, Doctor I keep thinking I'm God
When did this start?
Well first I created the sun, then the earth...

Doctor, Doctor I keep thinking I? invisible
Who said that?