PIP assessment at short notice.

I've just received a text message to ring and arrange a PIP assessment for myself, the message stated they have appointments available in the next 7 days.

The only available one I was given is 9am tomorrow morning.

I accepted it.

Have I made a fatal error.

I can't find anyone to go with me at such short notice.  And going alone terrifies me.

Is it normal to be given less than 24 hours notice of a PIP assessment.  Or are they playing games?