There might be help out there for you as well. Were you in the military? If so they have programs to help as well. If you need some assistance - I would not mind helping you. I need more details if you would like to share.
Generally speaking yearly income x 3 = safe mortgage.
The real question is does buying make financial sense for you. It could, renting might make more sense. Please look at the blog below and see which works best for you. Since disability pays no taxes you can rule out any tax benefits.
Even if financially it makes more sense to buy does it really? Consider the blog below for a different way to look at this. Buying means you have to do a lot or work on a house. Being disabled some of that could be impossible for you to do yourself and very expensive to pay to have done. Please read and consider.
Whatever you decide to do, I hope your housing decision is one that helps you to live as you both wish and is safe to do.