I am searching for a substitute of lactulose to take it during my period cuz I figured lactulose is not that effective during my period timing ( I get constipated despite taking 2 spoons) plus giving me a hell of gases. When my period is over, it's effect starts to kick in so I get diarrhea, lots of gases I felt my stomach gonna burst, and the anus area (internal wall of the anus) burns me a lot even after hours of doing the BM (is it a return fissure?!!) so I was wondering does movicol or minalax makes you gassy?!! Or bulky?!! Or any side effects. I was doing great post surgery until my period approaches every time

PS I sometimes also feel a throb near my tailbone area (there was one of fissures near it pre-surgery) does it mean my fissure is re-opening?!!) how does it feel that a fissure is reopened though no blood on stool?!!
Please help!!