Try getting into a push up position. When you go down in the push up, stretch your body as far forward as possible, and gently touch your nose to the floor, maintaining the body rigid and straight. Do that several times.
Lying with your back on the floor, raise your legs vertical, and ask your husband, or son, to provide resistance. While they do, with your legs straight, and keeping your butt nailed to the floor, lower your legs absolutely straight, until your heels can drop to the floor without injury. Repeat that several times. The resistance must be gentle, and not stronger than you, so your legs must procede down to the floor, pushing against that resistance.
These exercises are designed to separate and flex the vertebra articulations in the lower back, where nerves that often cause the pain may be "caught" between bone articulations, pinched, and producing that wonderful (not) pain.
You should feel some immediate relief from those exercises, but take it easy afterward, so the tissues can adjust and return to normal.