| Good morningt Jon,
How many times have I heard the same complaint? In a older home, and especially if you have galvanized piping, over the years minerals will buildup in the pipe walls. Along comes a homeowner that remodels his bath room. however, in doing that he disturbs the pipes and dislodges the crud built up in the pipes. When he turns back on the water and tests the new faucet the crud is sucked up into the inlet ports of the cartridge blocking the flow. Also by flushing the toilet it's also drawn up in the ballcock and blocking that flow.
If you're handy you might not to pay out that high service call.
Shut the water off to the shower, open up the shower valve and pull the cartridge. Clean out the inlet ports and before you put the valve back together turn the water back on for a minuteto flush out the supplies and valve body.
As for the toilet. Shut the water off and unscrew the three top screws and lift the float ball and stem assembly. Now turn the water back on to flush the supply. If you have a weak stream then run a wire down the open ballcock to break up any crud that may be blocking the flow.
Good luck, Tom | 
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