Change in side effects and how to manage 💩

I’ve been on Zep over a year and have been constipated to varying degrees. Well 4 weeks ago now, I suddenly developed diarrhea a couple days after the shot. I felt unwell—cramping, chills,etc—so I thought I caught a stomach bug. My kids actually had off poops too but not diarrhea. I took immodium and mostly stayed away from food for 24 hours and felt back to normal. My next shot day everything was normal but the following one I again got diarrhea a few days after. Again I took Imodium but I never had the same unwell feeling and was able to eat normally. I mentioned it to my GP who said she thought it was stomach bug vs Zep but here we are a couple days after another shot with cramping, diarrhea and now sulphur burps which I’d never had before.

Has anyone had their symptoms switch up after this long? Also for those who dealt with diarrhea and sulphur burps what helped? My doctor did say I could take Imodium and she wouldn’t really be concerned unless I was still having diarrhea after Imodium but I’d like to hear what other do/have done?

I had been taking a probiotic but got a better one my kids doctor recommended for them (adult version obviously).