Hypothyroid - don't go on low carb diet. You need the sugars. You might have hypoglycaemia (low blood sugar) due to not enough glycogen being stored in the liver. This effects adrenals etc and releases more stress hormones.
The Thyroid Solution Diet: Boost Your Sluggish Metabolism to Lose Weight is the first book that I have read that takes a scientific approach to losing weight. The author Dr. Ridha Arem is leading researcher in thyroid imbalances.
Hashimoto's Disease: Your Body Is Not Supposed To Destroy Itself Right? Gerald Mullin from Johns Hopkins says statistically somebody with an autoimmune disease is at risk of a total of 7 autoimmune diseases in his or her lifetime.