I am a retired nurse, now 81, almost never seriously sick in my life. In December, I was hit with severe Hyponatremia and I had never heard of it. Since December, have been in the hospital 3 times and rehab x 2. I'm getting physical therapy to regain walking. Addison's disease has been ruled out, but not idea of cause. If I feel anxious and hands get shaky, that's a sign sodium level is low. I'm keeping up with salt tabs, potato chips, and sometimes tomato juice. Supposed to be on low sodium for my heart, so on low dose lasix and potassium as doctor trys to balance it out. How does one find the cause of this problem? Dangerous and scary! (I was + for Covid at time of first episode of hyponatremia, but don't know if any connection. Never positive for Covid in hospital and rehab.) Sylvia