personal compelling reasons

Hey, i was looking for advice on personal compelling reasons to get back a year or two years of funding.
I have a few questions:
What kind of evidence do i need? I have a psychiatrist & a therapist. Both of which I can get notes from saying I could study this year (going to apply through clearing).

Am I able to start applying to unis through clearing now? Before my personal compelling reasons have been approved/sent in.

Can i expect this to actually get approved? I have had multiple diagnosis since university, and genuinely feel rready to go back but only have two years of funding.
Thanks for answering if you do. (new to the site so sorry if it s incorrectly formatted.)