I have a question... have any of you lost weight?

I am not liking this. When i was diagnosed with MG back in sept 2011 i was weighing 120 - 122 lbs (which has been my weight since i was 16)

When i started taking prednisone my weight shot up to almost 135 lbs.
After i stopped taking prednisone i was able to lose the weight and get back to my normal 120.

In the last month though i have noticed i've been losing weight, too much weight.

I am down to 105lbs and i am NOT trying to lose the weight...
Should i be worried?
I don't have an appt with my neuro til sept. 5th.