I recently overdosed on water. My predominant symptom was profound weakness and altered consciousness. I felt as though I was going to lose consciousness at any moment. Luckily, I was at work at a hospital when my symptoms developed and I just walked myself (barely) down the hall to the ER.
My sodium level was 124. The critical level for sodium at my hospital is less than 120. I had been drinking a lot of water for a few days to help with heart palpitations. ( I was told by a doctor two days earlier that I had symptomatic PVCs and to drink more fluids). While at work I started feeling crappy and was having heart palpitations so I started to drink more water, thinking it would make me feel better.
Before I knew it I had drunk about three or four 32-ounce glasses of room temperature water within an hour. I still can't believe I did this. It is very dangerous!