Part of the whole point of the Wii is the different controller design. People are begging in mobs for game developers to not just half-heartedly tag on Wii remote capability onto existing standard-controller games, but to actually develop Wii games that inherently and thoroughly make use of the unique controller... part of the reason they bought a Wii in the first place.
You can't have it both ways. The "classic controller" is meant for playing Virtual Console games, which were never designed for the Wii remote and were specifically designed to be played with the type of controller which is the "Classic Controller". With many games, modifying them to use a classic controller would involve radical changes in gameplay style and interface, and would only go and cripple the game's enjoyment with a Wii remote.
I'm sorry you're having medical problems, but that might just mean the Wii isn't for you. Just like other activities might not be for you. You should consider another system, or stick with Virtual Console games.