Keep walking...

Carla, keep up as much excercise as possible. Sometimes steroids can cause myopathy(spelling??) which means it makes large muscles very weak. That's why your legs feel like they're going to give out. I had that happen to me and it scared me cause not only did mine give out, but I was unable to get up after I fell on two different occasions. I literally had to re-learn to walk. Don't panic, I was on an extremely large dose of prednisone for a long period of time and was bedridden for a month due to a severe reaction/complication. I basically lost the use of my legs, but with excercise and walking I was up and about after awhile. It was very scary at the time.
el