Goodguy,
First off I'm sorry to here about your probable amputation of your other leg. 
Don't despair, it may seem like the end of the world to you losing your legs, but it could be worse. 
A fellow I met in the park last week is almost blind from his diabetes and he goes for walks in the park by himself. 
He is very strong person and more than just a little brave as well if you ask me. He told me he'd much rather of lost his legs than his sight. He said being blind is very hard. I tend to agree with him. Neither of us had a choice in our loss, but I'd much rather push myself around in a wheelchair than be almost blind like he was. You must keep your hopes up and be very strong and you will come through it like I did. It will take some time. I do know where you are coming from though. I'm a forty-seven year old woman and both of my legs were amputated last December right after Christmas. My stumps are too short and messed up to even think of using prosthetics. I get around using a wheelchair or a couple of sawed off crutches when I'm at home. This does work very well for me. Sure your life changes in many ways you can't imagine. There are things you don't think you can do until you try. I have gone fishing and swimming this Summer with my family. If you want to you can still do alot, if you don't get down on yourself. Somethings can actually be better. You have more time to enjoy some of the things in life that you were always to busy for. I just love sitting on my deck in the morning with a cup of coffee and watching the birds fly around the yard and visit the bird feeder my husband hung from a tree branch in the yard. 
I never really had time for this before. I was always busy with work or family things. The doctors have you do all these exercises during your rehap to build up your upper body strength so you are able to get yourself in and out of bed, your wheelchair, or to use the bathroom. Make sure you do these and build up your strength the best you can. It pays off. I ever had much for upper body strength before my surgery. Now I actually have muscles in my arms and shoulders that look like I'd been lifting weights when all I've been doing is lifting myself around. I do get days now and then where my spirit gets down. You just need to have the strength to get through these times. Family and friends can make a big difference. Hang in there and keep in touch.
Best of Luck
Wheelchair Bound
Linda