I have an autoimmune disease as well so I know your weight loss frustrations. You are on the right track with your approach and hopefully your body will respond well. You might also find these articles helpful as well.
Find Your Perfect Weight - Part 1
Setting a Healthy & Achievable Weight Loss Goal www.sparkpeople.com/resource/fitness_artic
Measure Progress Without the Scale
An Arsenal of Tools for Your Motivation www.sparkpeople.com/resource/motivation_ar
Reference Guide to Body Composition
An In-Depth Look at Body Fat, BMI and More www.sparkpeople.com/resource/fitness_artic