Maybe this information will give you some tools to get back out and wander the world... or at least the next province or state!
Take Charge of Your Travel is a guide for persons with disabilities.
The website for Canada is: www.cta.gc.ca
The website for American's is:
Click on the menu and you will find several subcatagories including all the regulations for travel by in North America and internationally. Also covers air, rail, ferries and buses and I found the section with frequently asked questions particularly informative.
If you are in an airport and see someone struggling... give a helping hand. If you see someone pumping up to a door in a wheelchair... take two seconds and hold the darn door. Smile and say hello and chat if you can because... someday it might be you!