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.

Go see a gastroenterologist. They specialize in GI issues including constipation. I personally have chronic constipation from meds I take for migraines. I also have gastroparesis which is slow motility. They put me on motegrity which helps.

I would like to invite @tadueo, @tam1964, and @oliveoyl123 to this discussion. They have shared some of their experiences and what they tried for chronic constipation in another discussion titled, "Problem with Chronic Constipation" - https://connect.mayoclinic.org/discussion/problem-with-chronic-constipation/, and may be able to share some more insights of their experience with you as well.

I have been dealing with chronic constipation since childhood- unfortunately, for me it never was resolved with fiber supplements or meds. My symptoms are similar to yours- to the point where I stopped going out to dine with groups of friends because I would have to leave the table due to the amount of gas. I was even in the drug trial for Linzess, which worked while taking but didn’t have any lasting effects when you stopped. My go to solution is Australian black licorice- works within a day to relieve the constipation- but again, only a temporary fix. I have done the whole route with gastrointestinal doctor and they just want to give meds- so I prefer the licorice to that. Best of luck, hope your issue resolves.

I got chronic constipation suddenly in summer of 2022. I had never experienced it before, except once when I drank too many protein shakes.

I’ve tried most all of the recommendations…..fiber, water, exercise, prunes, etc. I’ve also tried prescription med (Lubiprostone) worked well for 2 days and stopped. Getting ready to start Linzess. I’ve been following the instructions from my primary and gastroenterologists for over a year and that means it works and I go everyday. But, it’s not normal. If I didn’t take the Miralax, I would not go at all. Until recently, I took one glass if Metamucil AND one cap of Miralax daily. I found the Miralax works alone, so I just do that. It causes a lot of air…not gas, but air and I hate it. Plus, it’s like jello. I don’t like that either. The gastroenterologists have no idea why. I am scheduled for a colonoscopy next month, after a normal one in 2020.

I hope you can find relief. I’m so tired of dealing with it. I intend to utilize more online support. I think that is important.

I don't have bloody stools or pain and I have IBS-C. If I don't eat right, my stool is hard and it passes in dribs and drabs (or not). all day long.

Food and anxiety are my triggers.

Regarding food intolerances, read up on food intolerances and how to do a DIY test for what may bother you (if it is food).

DIY test(s) that you could try are 1. eliminate garlic and onion, big IBS offenders, which are also in many processed foods. 2. eliminate sugar, honey, agave, etc. and instead try pure stevia or pure maple syrup, but with a light hand. 3. Drop all fruit but kiwi (an amazing laxative) and papaya (ditto for some). 4. Drop meat and egg yolks and stick with egg whites and fish. 5. Eat cooked vegetables and not raw. 6. Try Lactose-free milk.

Do it all together or in stages. If you find any relief, then your situation may be caused by a food intolerance.

I could go into more details if you think you have food intolerances.

I tested positive for SIBO (they said I was "off the charts" I have such a severe case). So I paid $1,900.00 for a prescription that didn't do a thing, even though I took it all as directed. Very discouraging.

I do suffer from constipation, mostly from the opioid I take daily. I really have to prevent it due to Diverticulitis I get periodically. Fruit usually helps me and I take Slippery Elm supplement also.

Has pelvic floor therapy ever been recommended and has anyone tried it. I have tried every type of laxative and they work for awhile but then just quit working. I have curtailed activities because of the severe bloating. It is very frustrating. It is hard to discuss with family because the attitude seems to be I am not eating properly. I have seen a gastroenterologist but nothing seems to work for very long.

Hello! So sorry you are suffering with this! I have had many gastric issues, one being gastroparessis. I see my gastro doctor tomorrow for similar issues and severe constipation that landed me in the ER last weekend! I had surgery in October 0f 2021 for gastroparesis and I am afraid that it has recurred:( Take care and I hope they find out what's wrong soon!