My weight fluctuates up and down quite rapidly all the time. I have Lupus, RSD, IBS, Acid Reflux and Thyroid disease. The Thyroid disease causes my weight to go up and down, but the other diseases make it all worse too.
I was 120 lbs and now I am down to 107 in a matter of a few weeks. I hope you can figure out what is causing all of your weight loss, it sucks being sick.