The symptom picture is well known, and caused by secretion of a hormone SIASDH that depletes your salt. I would consider to be very serious, and warrants discontinuation of Tegretol. In the short run you should consult your internal medicine specialist and a psychopharmacologist. There are other medications to consider.
I can help you find a psychoanalyst in either new york or los angeles. email the web master at www.masteringstress.com, and make that request, and I will get back to you.
In the meantime, you can start your exploration online by going to the same place, taking a session, and asking for a professional review.