Sounds like the Plumber loosened up alot ofdebis in the pies and it must have clogged up some of the valves. First thing is locate main shutoff, turn it offf and take the bonnet off of valve that turns off water to fix.and turn on water and see how much dirt and water comes out, you will have to do this to all the valves and maybe ffix. faucets also take off areaters, its a job but you have to start at beginnig, let me know how it turns out.
Art retired plbg