Leg pain and restlessness. Helped?

My mother has had severe chronic leg pain/restlessness for years and required prolonged leg massage for like 3 hours every night for relief.  For the past 5–6 years, none of the medications prescribed by any doctor have provided significant relief from her leg pain and restlessness. We have consulted orthopedic specialists and rheumatologists, and the most commonly prescribed medications included Gabapin, Pregabalin, vitamin K2, multivitamins, magnesium supplements, and other supportive medications. But Surprisingly, after a recent hospitalization for diarrhoea where she received IV treatment, this symptom improved dramatically and has remained improved for nearly two weeks. She now needs only 10–20 minutes of massage, Could any medication or IV treatment have caused this , we want a permanent solution for that pain in her legs can anyone suggest if the glusoce or any other medicine from IV treatment helped ?