What does "Douka shiteru" mean?

Question:

I heard it in a song

Answer:

It can be translated in many ways,
-- (watashi/ ore) douka shiteru
What's wrong with me?
Whtat's the matter with me?
I seem absent minded.
etc.

-- (anata/ kimi) douka shiteru
What's the matter?
What's wrong with you?
You must be crazy.
etc.

--(something is) douka shiteru
Hard to believe that.
That's too odd.
That's crazy.
etc.