You're right, everything was working until the cold started. It's weird thou that the shower has a draining problem, not runing the water, and the toilet has the problem with water not filling up the tank. Is it posible that they froze like that, the oposite, for one water coming in , for the other one water going out? My husband was thinking to put some hot water down the shower drain, also in the toilet bowl and tAnk. Would that work or make it worse?