That's alot of weight to lose in such a short amount of time!!
Supplements!! (nag nag )

Do you have a 'therapy pool' (warm water) near you that you can walk around in and tread water.....excellent non-weightbearing excercises while you are losing the weight.
That has been a lifesaver for me as well. I have the bilateral piercing leg pain, so I know it's not fun to try and be active.....but the water thing......yes!