usually happens in a building with galvanized piping.hot water causes the pipes to aquire calcium deposits(rust) in the pipe and when a piece of that busts off it can clog the hot cartridge or the aerators(remove and clean).as far as the toilet, the flush valve might need to be replaced.they too can clog.it really could be a number of things not just that stuff.call a licensed plumber if you do not know what you are doing.stay away from the handyman-they usually dont know what they are doing either.most will provide you with a temp fix and you will be calling a licensed plumber in 3 months to fix what they screwed up.
dale
March 2010