What about those in prison who are chronically ill or people who caught something while being stuck in there? Surely they would have it far worse than those ill people in a regular hospital who, technically, can refuse treatment, leave, and even go elsewhere for treatment. That's not considering the support structures that people in prison are given/allowed, vs support structures generally present in a hospital setting.

Your feelings of being trapped are valid. The frustrations of a less than ideal physical existence are heard. Being ill in any location truly sucks. But depending on the location, you may have more or less freedom and opportunities available to you.