Go over to the Tenkara forum and begin researching this style of fly fishing. Forget the Japanese aspect. Fixed line, long rod fly fishing has it's roots in centuries past in cultures of the Mediterranean, the United Kingdom, among the Seminole Indians in Florida, is still practiced in Italy, and was popular in Appalachia in the 20th century as well as in Japan. It is the oldest form of fly fishing. The rods are 11-13' long and exceptionally light. Combined with a long-handled landing net, it's an excellent form of small stream bank fishing for trout and pan fish. It can also be used from small boats and personal watercraft.

Also consider light tackle switch/spey (2-handed) fly fishing. For the bank fisherman...even wheelchair bound anglers...this will give you exceptional range! You can fish big rivers.

Finally, talk to your docs about seeing a pain management specialist. You seem to be at the point now where corrective care options are limited, and it may be time to think about just giving you pain relief for quality of life. You'll be amazed at what you can do if the pain is just significantly reduced! Trust me...this is a subject I'm personally very familiar with.