I “go” in the am but still backed up, Slow transit time

I eliminate what I think it’s pretty good in the morning, soft, long skinny stools but a couple big piles, (I take lower bowel stimulator and it helps) But a few days go by and I look pregnant and feel full like I can poop at anytime, but I don’t go.
I take one ducalax and bam 6 hours later, my stomach, after pooping for two hours, off and on, is flat again. I feel amazing I can go out and about without fear of a accident or feeling backed up.
Also when I’m feeling pregnant belly backed up poop feeling, my acid reflux is so bad!!!
So this is constipation right? Or is it sluggish colon?
Thanks,

I have basically the same thing right now. I’m using Miralax in the am now. I think it might be inflammation. Had the first loading dose of Remicade. There’s no bleeding . In the morning a lot of gas . Took senna two days ago. Felt better took half the day to eliminate everything. I’m afraid to take too many laxatives with stimulates. Rectal meds really aren’t helping. Hoping next loading dose this Wednesday helps.
If you find something that works let me know!

Miralax doesn’t help like ducalax but my GI doesn’t want me to use a stimulant