Is your thirst something new? Has your doctor been checking your blood sugars? Even if the thirst is new to the diet, still should check fasting and 3 mo. Glucose.
Do you have a gluconometer to check Blood sugars yourself (easy and inexpensive)? They are helpful for everyone to test your reaction to different foods. http://www.wheatbellyblog.com/2014/...ool-fingertips/

When starting a new diet like Low Carb, people blame every symptom on it, when it could be hormonal changes, thyroid, a tropical infection, low grade flu, new medication side effect, whatever, he usual things not related to diet. As Barb suggested, see a doctor to rule out something else. Hope you feel better