Something my pulmonologist keeps reminding me when I get discouraged about this very same issue is that, despite doing all the right things with diet and even with exercise, not losing the weight after heavy prednisone therapy is common and it's not something that you should get down about. Keep telling yourself that. Prednisone is known to cause your body tissue to retain fluid, not just in the feet, legs, and hands but throughout your WHOLE BODY and that's going to take time for your body to get rid of. When your therapy is done and you've tapered off the steroid is NOT out of your system. It takes time before it disperses out of your system (hence the need to taper off) and it will take even longer after that to get rid of the excess fluid build up too. Don't be too harsh on yourself.
Something he always reminds me to do also is to never forget to drink LOTS of fluids. As silly as it sounds when your retaining fluids, it helps your kidneys flush the excess fluids out of your system faster if you do... and that means water, not soda or sports drinks, etc. And, of course, keep moving. Movement is another way to get those fluids going too. Stretches and walking are great for getting the excess fluids out of the tissue.
I really feel for you. I'm one of those "more in the hospital than out" people... the kind that knows the ER and ICU staff like family... so I totally get what you're going through. Lots of hugs to you and best of luck with getting back to the "norm" and keep breathing well!