Once the sale has occured, it generally takes about a month for the Bank to knock on your door and ask you to leave. If you're lucky, they'll offer you what's called "Cash for Keys". If you're unlucky, they'll have the Sheriff evict you.
Unfortunately, Landlords all too often collect the rent while failing to pay the mortgage.
If you can call me at 951-571-9229 I will call the Title Company and do a search on filings against your property (which is more up to date than any online stuff).
You should do a google search on landlord/tenant rights for your area and see what he came up with. If neither of you understand what the other is saying he may think that he rented you the house only and you may think that you rented the entire property.
Again, you may also want to post a message on http://www.LawGuru.com and ask an attorney your questions.
My answers to you are based on the info you have given me and are my opinion only. It is hard to know how to answer sometimes without seeing the paperwork involved.
I'm so sorry for your troubles and wish you well - hope you get it all straightened out soon.