 [ Symptoms ] i feel exausted when standing to urinate in the morning i feel like i need to hold on to something any idea what it is  i get this feeling even when not urinating but standing still also i can feel my heart beat increase and feel like almost hyperventilating i have mildmoderate asthma and a generalized anxiety im 17 years old it almost always happens when i wake up and need to urinate i do not think urination has do do with it but rather standing still after waking i feel like when urinating i need to hold on to something or i may collapse out of exaustion [ Disease ] there are no recommendations of fluid by weight it is generally accepted that drinking to thirst should be adequate unless you have certain medical conditions participate in intense or prolonged exercise or live in hot climates the institute of medicine does have general fluid guidelines    11 or more cups per day for women and 15 or more for men this includes fluid from food and beverages even caffeinated drinks like coffee see this article for more information