Good luck with your biopsy on Friday! I know the waiting is such a hard part, even a few days feels like forever. In my experiences with my mom's biopsies, they told her she would hear from them within 3-5 business days. Unfortunately anything from Wednesday onward doesn't usually come back until the following week. Some take longer than others, but most of my mom's were back on the shorter end so hopefully you won't have to wait too long. Try to keep yourself occupied with things that make you feel good, I know it is going to be difficult but you don't have much of a choice but to wait so may as well do something good for yourself. If the weather is good, maybe take a walk in a park or nature center, have a picnic with your friends or family... I find reading is also a good way to keep my mind occupied.
I can't give any advice on the disability insurance unfortunately, but I'm sure there are a lot of people here that can.
Hang in there, and let us know how everything goes! Come back as often as you can/need. We will all be thinking of you and your family as you make your way through this journey. Hoping everything comes back ok!