You put your faith in the plan for the first few weeks and you had great results, now just because you are jumping on your own scales (naughty, naughty) you are doubting it. Why? You should only use the results from your class, and nothing else. I know its easy to jump on your own scales (most of us do) but this is exactly the reason why we shouldn't - you can get demoralised if you don't see the results you want. Weight fluctuates so much from day to day and even during the same day, which is why you should only do it once a week, same time, same scales.
I know its hard when you can't exercise, (I have been off work since last February after having a knee replacement which has gone wrong and can't do much at all), but your ankle will be better soon and then you can start and do some.
Have faith in what your consultant is telling you, and if you are doing what you are advised to the letter, you should have no problems at all. More to the point, have faith in yourself hun, you can do this if you really, really want it. Just don't panic.
PS start your own food diary in the diary section and we can have a look at what you are eating in a day, it might help.