So sorry to hear your having problems
First priority - your house (is it rented or mortgage?). Do you have family who can help you out? If mortgaged, have you had any advice, citizens advice etc?
Secondly, if you have to close your salon - could you consider keeping your things. Second hand value is so far short of what you will have paid out. If you could keep them for now while you maybe get another job just to start earning some more so you don't get further in debt, you may find you can pick up again in a few months or so (even if it's by doing some mobile work etc). Even if you still end up selling, at least you will have had time to consider your options and not have got rid of things you may regret.
You may have thought these out already but just wanted to ask incase you haven't as I can understand how stressed and panicked you must be feeling. Take care & good luck. x