Hi, I am wondering since you have a positive ANA you gastrointestinal problems may be Crohn's disease. Crohn's is an autoimmune disease. I am wondering why you had thyroid surgery. Why was there no need for thyroid medication. If it has been a year since the blood work request that the doctor repeat them all. See what your A1C comes back as. Diabetes is a cause of neuropathy. Also, if your ferritin remains low it could be the cause of the feeling cold all the time. Low iron can cause that. Without going into detail low iron can also cause low levels of O2 in the blood which can cause lightheadedness. As for medications, I think is going to depend on how the tests come back. I take Cymbalta and have gotten some very good results with that. Good Luck and Welcome to the site!