In order to qualify, you need a 620+. If its below that, you may find a lender willing to help you, but you will have to pay a higher rate. Therefore, depending on where your credit was and what it dropped to, you may or may not qualify, credit speaking.
Dont forget you need some equity in the house and qualify income wise. It sounds like you have plenty of inocme, but if you have pleny of expenses that could disqualify you as well.
Well I hope I gave you a starting point, if you need more information, please give me a shout.