You're going to have kidney failure. You need 64oz of water daily and you're only drinking 20oz AND it's soda?! Soda works as a diuretic which means it's making you excrete more fluids than you normally would with water. Don't drink soda when you're thirsty, always water. You need to stop this habit or you will severely damage your kidneys. You need to go to the hospital to get hydrated and you need to stop that habit unless you don't mind kidney damage.