Sediment broken free in pipes has likely caused lower water pressure

Thanks guys. I don't have a crawl space or anything so repiping would basically be a complete remodel. I think what I'm going to do is use the neighbors hose and try and hook it up to my shower and back flush the water from there since I'm guessing that's the first stop that the cold water hits when it gets to the house. Since every faucet has low pressure whether it's cold or not, I think the disruption is in between the shower and the water lines outside before the water splits off to the water heater. Hopefully it's just right there as it goes into the house. Going to need to call the water co. because I can't get my main to shut the water off completely. Too corroded.