"I live in Texas. Where would I need to go to see a doctor, get a script, and buy cannabinoid pain patches and what would be the cost for each step of the process?"
Cannabis in any form (medical or recreational) is illegal in Texas. However, you can get hemp-derived CBD products (less than 1% THC, which is the psychoactive component of cannabis) shipped to you; no prescription needed. Check out SIVA Patch http://www.sivapatch.com/