Broken thermostat (hypothalamus). Any ideas about what's wrong and how (or if) it can be treated?

Added 16 Jan 2012:

Cetteferge,
Thank you. There is a lot of additional detail. My body has not been the same since the meningitis. I first noticed that even 12 - 15 cans of Ensure a day didn't help me regain weight lost in the hospital (11 days). Couldn't eat solid food for weeks because of full facial palsy from nerve damage. Then I developed Diabetes Insipidus (no relationship to 'regular' diabetes - normal glucose levels- if 190 four hours after a meal is normal), and although I described the proper testing procedure, the testing was inadequate - no serum test for ADH from Pituitary, no water deprivation. So I was told the test was negative, and so no treatment. I then developed PMR, Polymyalgia Rheumatica, an auto-immune disease treated with Prednisone. I was referred to a Rheumatologist who did the proper lab tests and with the Prednisone I went into remission very quickly. But the taper was too fast, and I told her I could feel the pain returning, and what should I do. Her answer, you'll be fine. Six weeks later I could barely move. I upped the dose - remission again. Then decreased to Dr. dose. Told her pain was again slowly coming back, "You'll be fine." Three weeks later - same deal. Then two weeks later. Then," your pain is spine based" (stenosis), referred to orthopaedic surgeon, he said no pain from spine. Response: "Just stay where you are, you'll be fine." While at surgeon's office, syncope, trip to ER, diagnosed with DVT leading to diagnosis (chest x-ray) pulmonary thrombi, now also on Warfarin. It keeps going, but one last thing, I have gained significant weight (25 %) that I'm now losing fairly quickly because Warfarin makes food taste terrible. Tell me anything else you might want to know.
Thanks, Ross