Look at TheMSGym online and there is a Facebook page for MS exercises..
I had PT and here in the U.K. it is the best way to get walking aids. Make sure it is Neurlogical Physiotherepy you get as this differs from standard PT. Lots of balance exercises and core strengthening as that helps with balance. There is a device called a FES (Functional Electrical Stimulator) which can be useful for foot drop and can be worn during exercise for help in moving muscle, so it might be worth a shot (try any medically recommend assistance) and let us know the outcome