What I will suggest is make a copy of the form to make a sloppy copy first, write on that one and then transfer your answers. That way if you make a mistake, or want to modify what you wrote it will be neat. I know this is more work, but worth it in the end. Also, you got good advice by keeping a copy of what you do send for yourself, that way if you get a call and they want to go over anything, you have it in writing before you.
I know it seems overwhelming, and is bad timing for you, I feel for you, but it is all part of their little game, and the more detailed information you give them, the better off you are. And answer each question thinking of your worse day or worse case scenario and ask hubby to do the same. Don't sugar coat anything, always answer what the worse day, worse pain, least amount you can do is.
Best of luck to you on this and everything else you have going on. I hope in the end, it all works out for you.