Welcome to the colitis club! Not a fun club to belong to. I was diagnosed as a child (they called it juvenile diveritculitis back then), then had a bad time with it in my early 20's, when they started calling it general IBS. Started having colonoscopies back then, and have them every 3 years (I'm 38 now). In 17 years of colonoscopies I've only had 2 polyps, and they were benign, thank goodness. Everyone is different. I go through months, if not years, of being 100% fine, then I will have months of endless diarhhea. Then months of constipation. For me, when I'm in the diarrhea bout, I have to avoid tomatoes, fiber, lettuce & fruits with a skin on them. When I'm in the constipation bout I have to take fiber supplements daily, and eat more fiber than I think is humaly possible. It took me a year to figure out what I could & could not eat. You will figure it out too!
I have never been medicated for this other than the OTC Miralax, fiber supplements, Immodium & laxatives. Thankfully I've been able to manage it without an rx...so far.
Stay in tune with your body, and you will soon learn what your triggers are. Make sure you have a good gastroenterologist & get check-ups regularly. Good luck!