Mrs Roberts, of Pentrefoelas, Clwyd, North Wales, had severe symptoms while expecting Harri, now four. Maternity belts, which run under the bump and round the back, physiotherapy or medication did not help.
"I was in constant pain," she said. "It affected me mentally as well as physically. It's like you're being stabbed repeatedly and this shooting pain spreads everywhere until you can't do anything."
Her husband, 41, started using materials at his clothing business to make a girdle to try to help.
Mrs Roberts, who has three children from a previous relationship, Nathan, 22, Aimee, 20, and James, 16, said: "He would bring something home every day and it went from there.
"By the time I was seven-and-a-half months pregnant, the prototype came in."
The girdle, which could help the one-in-five pregnant women who suffer the problem, has featured in a major NHS research project and clinical trial in Wales.