Asking to be reassessed is basically the same as when you applied for PIP in the first place.
You will be sent a new PIP2 which you will need to complete in detail. it will certainly help if you can provide new evidence that details how your conditions have worsened.
It's almost certain that you will have a new face to face assessment.
Finally a new Decision will be made that supersedes the existing one.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems