You know I think the easiestt way to address your concerns is to give a mortgage lender a call. They can go through all of your unique variables and get you pre approved. Don't stop there! It may be a good idea to get more than one lender to quote you.
Before you can go purchase a property, or even look at homes, you will need to have your financing lined up. Get started, who knows if they will extend the credit or not. Remember, you have to close by November 30!
That is less than 90 days out!