I also have no insurance and was very worried about getting the care I needed. I also live outside of San Antonio. Cancer Care Centers of South Texas have been very helpful in reducing the costs of my treatments
(they helped me to qualify for free Chemo drugs from the manufacturer).
I had an MRI scan done at American Health Imaging that was half the price of anyone else in town. They are close to the medical center area.
Hang on and don't give up.
Steve