I use miralax practically everyday. I do find that after a few weeks, I need a break from it. I switch over to Milk of Magnesia pills. I think the magnesium helps to rebalance what happens when I keep all the stuff flushed out of me. I do find I bloat whether on miralax or off it, its just the way my tummy works.
If it helps your fissures heal, wait for them to become completely healed and then search for other relief I wouldnt want you to go thru that again.
eat yogurt! activa is a good thing for many.