An easy way to test for water pressure is to buy an inexpensive gauge at a big box store for under ten dollars. It simply attaches to an outdoor hose bib or to a garden hose; and, by turning the water on it will tell you what your water pressure is at.
If is is over 80 lbs PSI you most likely have a failed pressure reducing valve and this will need to be replaced and an expansion tank installed, if you do not already, have one. In many older homes the expansion tanks were neglectfully not indicated on the installation. Usually, the newer homes of today already are equipped with an expansion tank; and some townships & cities are now requiring upon installation of a water heater, inclusion of an expansion tank to meet with the newer building codes.
A Master Plumber’s cost for installation of a new pressure reducing valve and an expansion tank might be somewhere around 500 dollars.