Mosa.... You are not alone. There are many people with issues like yours and fortunately, there are many wonderful and helpful articles on line that can help with practical advice as well as personal stories how these challenges have been met.

Here is a good place to start...... By Hook or By Crook – Gardening

One more that you might find helpful .........Gardening for Every Body

Don't give up - If you need more articles - I can send more links

You can also check out www.accessiblegardens.org - for tons of information, tools, and stories about how disabled gardeners - some completely wheelchair bound have managed to continue their love of gardening by adapting to their limitations. If you need something to make you smile, check out the Elvis video.