I had some significant issues with this and food not digesting quickly and leaving my stomach. Very important to get it resolved as it can combine with feelings of fullness and nausea to make for a inability to eat and significant loss of weight. Its great you are feeling so well. I felt terrible but better to nip it in the bud before it becomes an issue.

From most gentle to most aggressive
senna
colase
miralax
magnesium citrate (didn't use, but heard of it)
lactulose (also called generlac) - the heavy guns