Hi. I had a prolactin secreting pituitary tumor removed in 1993. I had Diabetes Insipidus for about 3 months that resolved. They removed my pituitary gland which after several months regenerated (very odd/rare) for this occur. I was able to have 3 children naturally (also unheard of I m told). I had no DI for approx. 15 years. It re-developed about 6-7 yrs ago and numerous endocrinologists have worked w/me trying to control my sodium levels. Through various tests, they ve found I make no DDAVP and have little overall adrenal functioning, but not total. I have been hospitalized 3 times in 3 yrs for hyponutremia. My sodium has been as low as 114 and high as152. I have been stable for 1 1/2 yrs on .3 DDAVP BID and maintained sodium level around 140. I also take 20 mg of hydrocortisone , 50 mg of synthroid , 100 mg of progesterone, and have a patch for estrogen. On Jan. 20 I was hospitalized w/severe abdominal pain and was treated for a possible UTI. Sodium was 135. I went home after 2 days. By Jan. 25 my sodium was 122 and dropping. The ER docs were great and followed my endocrinologist s orders. However, when I was admitted to the hospital, because my endo doesn t have privileges at this hospital, a GP took my case. I told him no fluids, 50 IV of hydrocortisone, eat protien, and NO. DDAVP. He refused to call my Endo, later told me had, and that she wanted me to take 10 mcg of nasal DDAVP. I told him I couldn t do the nasal and that it would cause my sodium to plummet. He would listen to me and said this is what your doctor wants. For 3 days I stayed at 115 (they gave me 3 nasal doses during this time). They brought a nephologist in who immediately called my endo. She had NOT given any orders for the nasal and the doc did not tell her he gave it to me. The nephologist put me in ICU and I was watched closely w/no DDAVP. My sodium shot up to 138, so they slowly brought it back down, and over several days raised it. I was released 7 days later w/a sodium of 138. I was dizzy, continue to have major balance issues, cognitive problems, vestibular issues, can t drive or work. I m a psychologist so this is a huge problem. Since my release, I ve had 2 MRI s, daily labs, seen an opthomologist, started vestibular PT, and regardless of how little I drink cannot maintain a sodium above 129 for more than 3 days. I am down to .2 DDAVP BID, limited fluids, high protein diet, and anything obvious has been ruled out. My nephologist, endocrinologist, and I are completely frustrated. I pee too much and am always thirsty. The MRI s showed numerous ischemic areas; probably from the numerous times I ve had sodium fluxes. I really trust both my docs, but we are at our wits end trying to figure out why I can t maintain my sodium. When my dose of DDAVP is cut more my sodium goes too high. Any ideas or thoughts what might be going on? I m feeling pretty desperate. Thank you. Lucinda