My question involves court procedures for the state of: Texas

I am Pro Se. I am being sued by a previous apartment complex. I broke a lease early and had to leave due to family illness. I have filed an answer, motion for change of venue, and motion for discovery. I live in a different adjacent county to where the lawsuit was filed. I received notice that the motion for venue change was granted by the judge. I have also received a date of the new hearing in my county. It is for September 12th. However, I am disabled and suffering from worsening vestibular problems from brain tumor surgery. I am also suffering from spinal stenosis and recently, a slipping L4-L5 vertebrae. I would like to file a motion to appear via telephone.

Questions

1.) Have not heard back regarding my request for discovery. Why would this be? How does this usually proceed? My next step?
2.) Where can I find a form to file with the court to appear by telephone?

Thanks!