Try not to listen to advice to buy a new bladder tank. Your tank is fine, it just needs some air. Open a low tap with the pump off and drain most of the water in the tank. Open any valve up the side of the tank if possible to allow air in. Close it up and turn on the pump and you are back in business. You probably have a device to get air into the tank that is not working any longer. Dial 911 only when the tank squirts water at you through a seam. Sears has a nice glass-lined tank for around 200$ for the day your tank really dies. If you are handy, an air compressor is a easy way to put the air cushion back in.