Chronic Knee And Leg Pain, Hair Loss. Due To Taking Nerontin? History Of Cancer, Abdominal Resection

Hello. I am a 60 year old woman, have gone thru cancer twice, 2 abdominal resections, a radical mastectomy , plastic surgery , on the left breast , lymp nodes removed, underneath, left arm ,radiation twice. After all that, I was left with some problems. Just plain WEAK, Chronic Knee and Leg pain, no energy, and NOW, as of late, my hair is starting to come out ALOT AT A TIME? It s getting thinner, and thinner? My last surgery was one month ago, for yet ANOTHER ABDOMINAL RESECTION, ON MY BOWEL AREA. They put me on Nerontin. Could this be making my hair fall out