Under the wide umbrella of autoimmune diseases there are so many different types of diseases. So it will be helpful to know what are some of the conditions you suffer from or the symptoms. Most of autoimmune diseases are connected with the adrenals and as you know adrenals work with liver and thyroid.
Do you have adrenal issues? Did you go through a trauma recently? Did you eat processed foods? Did you have vaccines, allopathic medications or drink alcohol?
If you have any adrenal issues, I would stop fasting right away and work on your diet. Fasting is very taxing on your adrenals and needs plenty of rest. Nadia has some good points. I am not so sure about eating meats, though. I always felt that heavy proteins and antigens create inflammation and disease. Although I have read both opinions and this is controversial subject.
Perhaps you can read the following and make your decision.