How, when did you know you had DID? or MPD?

When my lunch is unmade in the morning and I clearly recall making it last night. When my laundry is unfolded and I know I folded it. etc........

MPD

I have a bunch
(if not more)
Of people in my head
They get up at night
And play tricks on me
When I think that I'm in bed.

I wouldn't mind,
If one of them
Was an O.C.D. neat freak.
Who'd get up at night and
Clean my house,
A couple times a week..

I don't have it.
I dated someone that did.

Ended up, he wanted to kill me.
He was sick, very sick.

I am still questioning if I do. In ways I believe I do, but I still wonder.

IDK