Next time just hire a better Loan Officer because if he would do his job right this wouldnt happen.
As the people below said, if you haven't removed the loan contingency, there shouldn't be any sort of problem. If the contingency was already removed, and you have a denial letter 99.9% of the time the other side can see that there is nothing you can do, and they will cooperate with you.
I hope your Realtor is taking a proactive stand and helping you through all of this. If not, go above them to their broker or manager and ask for help.
"Advice You Need, Attention You Deserve"
Do a little reading of the contract in your FHA financing paragraph and then the void paragraph. Good luck!
-doug francis ABR