You should contact a mortgage lender that is authorized to do FHA mortgage loans. FHA have a mortgage loan program that might accept your credit score. You would be required to have a higher down payment under this program than others, that would be qualified for the normal 3.5% down payment.
You would need a few things in order to qualify for this program. You would need proof that you are receiving whatever type disability you are currently receiving. You would also need bank statements.
Once you have contacted a FHA mortgage loan officer, you would be pre-approved for a mortgage loan. In the event you are denied your mortgage loan officer would be able to tell you the reason for the denial.
If you have no debts on your credit report you are required to pay each month you would not have a problem with your debt ratio. This is the ratio that would determine the amount of house you are able to purchase based on your income and debts you are required to pay.
I hope this has been of some benefit to you, good luck.