Foaming at the mouth? Terrified of drinking water? You're displaying all the signs of hydrophobia, a common symptom of rabies. Unfortunately by this point you're probably beyond curing. Or reading online definitions.
Take hydro (meaning "water") and phobia (meaning "fear") and you have hydrophobia — a fear of water. This could be a purely psychological issue that started in the lake at summer camp, or it could be physically motivated by disease — such as rabies.