One more thing, Celia16, I have much more going on in my gut than constipation, but as a "Hail Mary" to your plight and given you have tried so many things, what is working really well for my constipation (no more clay or hard stool) are dietary enzymes from a company called Intoleran.

I discovered the firm on the Monash app. I use their carb products (3 different capsules) and added in Pure brand "pancreatic" enzymes and some Hydro-Zyme brand Betaine HCL.

I added in each of these five supplements one at a time and saw different types of improvement in each.

For all I know, if you try all five, you may need fewer than all five and can cut some out. These pills and a Monash green-light only low FODMAP diet are the biggest game changers for me.

(As far as dairy goes, I just use Lactaid products. And I still have to watch what I eat and how much of everything I eat.)