There's not a ton of official resources yet, but here's an incomplete list: 

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First up, contact your bank and let them know you've been shut down.  Ask them if they'll let you defer some payments on any loans you have.  You can also apply through local banks for a low or 0 interest personal loan backed by the Federal Government.  Do the same with your Credit Card company.  They will very possibly give you something like 6 months at no interest. If they won't then you should shop around for a new credit card that will. 

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There are 3.75% interest SBA loans available as disaster relief to cover economic damages.  It's hard to decide what to ask for, but take a good generous guess.  It's hard to know how long this will last.  Congress is in the process of passing a bail out which will most likely include grants (money you don't have to pay back) that you can use to pay debts, payroll, rent, and or mortgages.  The loan/grant will most likely be limited to 2.5x one months total payroll.

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Here's a link to the SBA Disaster Relief loan:  SBA Loan