Dicyclomine
"Crohn's for 16 years, recent IBS diagnosis. This medicine was very effective 18 months ago. I went off it for 2 weeks 6 months ago to see if I still needed it, and thought it was still helping. I didn't know the nausea, extreme tiredness, and weird head symptoms (like I drank too much coffee/high, dizzyish) could be related to this med since I'd already been on it for a while. The nausea and weird head symptoms got progressively worse and more persistent where some days I'd just need to nap right after waking and was not functional, while trying to raise 4 young kiddos. Thank God, I finally eliminated the dicyclomine, after changing many things about my life. Now those symptoms are gone. Still IBS symptoms that I will deal with for now."