Hello @linn1, Welcome to Connect. There is another discussion that you might find helpful --- IBS sufferers – MRT and LEAP: https://connect.mayoclinic.org/discussion/ibs-sufferers-mrt-and-leap/. I did find this information on the topic of treating IBS without medications.

"How do I heal my IBS-C gut?
Feast on fiber-rich foods: Enjoy high-fiber whole grains, veggies, nuts, seeds and fruit. The fiber in these foods will keep you fuller longer, but it's also good for your gut. Don't be afraid of fat: Choose healthy omega-3 fats, like wild salmon, sardines, flaxseed and seaweed. Sep 23, 2020"
--- 9 Ways to Help Tame Your IBS: https://health.clevelandclinic.org/good-for-your-gut-9-ways-to-tackle-ibs/

Have you tried any diet related changes to see if they help manage the symptoms?