[Health Concern] Irritable Bowel Syndrome

I often experience indigestion and stomach pain. I used to love bread, but now I don't want to eat it anymore. I also try to avoid spicy foods. However, lately, because the weather has been hot, I've been drinking iced Americanos, and my stomach pain has been happening more frequently. I love coffee so much that I can't quit, so I drink half a packet of Kanu after breakfast and lunch. I don't always drink ice, only after lunch, but I still experience these issues. Even though I try to control it, my stomach often hurts, and it's upsetting.