This post makes me feel seen. This is for the people with similar GI issues to me:

Psyllium powder: Multiple of my medicines made my GI tract so slow, it caused constipation that's sent me to urgent care multiple times. My body had no motility to push my poop through and out my intestines. It sat there, and no matter how much psyllium powder I took, it wouldn't budge. I drank so much water I sometimes couldn't stand. It was acute water poisoning. My brain was swollen constantly from over hydration and I constantly had migraines. I barely took breaths between chugs of water all day, and I barely passed stool.

Here's what has and hasn't worked for me.

Psyllium, Lactulose: Was still drinking brain swelling amounts of water. Psyllium did some work. Lactulose moved my bowels, but was majorly unhelpful in many ways. It's a sugary syrup that my current GI doctor told me never works well for anyone. It made me get tons of gas that smelled so bad, everything and everywhere in the house stank. It was worst when I ate tuna. I halted having guests over for months... Then I got my first GI doctor. After my GI doctor put me on better meds(in following paragraphs) I stopped taking Lactulose and had to wash my clothes and bedding with cups of baking soda in the laundry. I don't think the stink would've come out otherwise.

Psyllium, Miralax, Amitiza: I was told by a GI doctor to use psyllium husk powder and Miralax together, everyday. And also a laxative prescription Amitiza. It gave me migraines, but at least my bowels moved. That's 3 total GI meds.

Psyllium, Miralax, Linzess, Motegrity: The Amitiza at the highest dose stopped working on its own. A stronger one was assigned called Linzess. Later Linzess also stopped being enough, but it was continued. Motegrity was added. That's 4 total GI meds.

Linzess, Motegrity, Citrucel: When I asked how I could minimize the amounts of things I take, they said to stay on the prescription laxative. But stop the psyllium husk fiber and Miralax, and replace them with Citrucel. Citrucel is sugar from citrus fruits which has a laxative effect, and it's a fiber supplement. That's 3 total GI meds.

The constipating medicine dose got lowered, I gained some motility, and have shit my pants times than I can count. I've changed my daily Citrucel amount many times. Too much= diarrhea from too much laxative. Too little= diarrhea from too little fiber. A bit too little= semi constipation. A bit too much = wishing you took a bit too little instead.

As someone else said, you shouldn't be ashamed of a bodily function you can't control. No one should stop themselves from getting help for this stuff. Now I'm so satisfied when my poops come out healthy. I came a long way!