Talk to Gastroenterologist on Gastric Issue

I had watery stools two years consultation I had been given colofac,librax and some other medicines and it became good few weeks later. Then again I had this issue. Doctor diagnosed IBS and gave some diet restrictions and a dietary fiber fibrocol. I have been taking it since a year daily. Problem is that when i skip it for a day or two,i start having watery stools. These stools are once or twice a day only. When i take it again,it resolves. Second issue is i note sometimes a mass in lower left side of abdomen,which occurs someday and disappears other day. I feel gases sometimes when i try to press it. Cramping,gas are issues. Other than that I have several lipomas in body ,abdomen aswell. Also i have vp shunt due to hydrocephalus .