I suddenly developed IBS-C last fall. I am 70 and never had issues prior. I am under a lot I'm stressed so I figured that's what the brought this on. After following the low FODMAP diet for months and using miralax daily I still have symptoms. Could barely go on my own. I went to the gastroenterologist and she put me on Linzess. It didn't work real well at first. But then I read about drinking a lot of fluids, and I mean a lot. I shoot for at least 100 oz daily. But in the morning when I do take the medication I drink at least 20 oz of water / coffee first then take the Linzess. Since increasing my water intake daily and especially in the morning I am doing really good. I have complete BM everyday. I still do keep track of what I eat primarily getting fiber shoot for 20 to 24 g of fiber. I get that with eating chia yogurt pudding walnuts and kiwi. I also started brewing my own water kefir I'm not sure how much that is helping but I'm going to continue. Just wanted to share my story hope it encourages someone. Blessings to you all