Interesting because I belong to a chronic constipation group online. If you want to search in groups on Facebook, the name is Reversing Chronic Constipation. You would be surprised how large this group is with new members every day.
First of all, Miralax does not work for me. I've been dealing with this a long time but has increased to the point that I and other members have found something could help a long or short time and then stop helping and trying.
That happened to me
with Milk of Magnesia.
I had very short success with Miralax. Then short success with Ducolax.
I have had a script for Linzess that did not work. as well as Amitra (spelling).
I will be back yet tonight to assist more important info.