Is it furnashed or unfurnashed?
You could have a chat with your landlord, explain the situation to him/her (obviously if they're not going to pay you).
Dont pannic thats the main thing, I know its difficult, I have also had alot of dealings with IS & council etc, you can get your IS & HB backdated, you need to apply for a crisis loan for the maximum ammount & keep your fingers crossed you get it, doubtfull you will but theres always hope. Is there anyone you can borrow from? What about his mother?
If its unfurnashed it will take alot for a landlord to evict you, there's the month owing, then he has to give you notice, then he has to get court order - don't let this worry you its just how it goes it won't go against you. It probably wont come to that but you cant just be evicted.
If however you are evicted you will be placed in emergency accommodation where you will be looked into by the council to see if it was your fault you were homeless (if you leave before court order of eviction they will think you intentionally homeless and you will be pooped) otherwise you will stay in emergency accommodation until the council can house you.
But first off apply for a crisis loan or something and see what tomorrow brings, you can worry about the rest later.