I agree with pps you always prioritise rent above everything else.
That said the issue is immediate.
What money do you have currently and how much is your rent?
Have you any direct debits due out in next couple of days? If so contact the companies concerned and see if you can move the dds to later dates, I've done that at times when things were tight.
Sell/pawn anything you can.
Borrow from family/friends
Call shelter, this is exactly the kind of issue they can advise on.
Monday first thing contact your local welfare rights advisor to get help with your budget and income.
Frankly cm is very poorly enforced here in the uk and I would advise NOT including it in your main budget.
Create a budget that doesn't include that and see it as a "bonus" IF it's paid.
Hope you're able to sort things