Consider what else you ate that day.
Consult your doctor.
Vitamins, water, fiber, anything basically very much out of moderation can cause somewhat negative results.
Good luck.

Just wanted you to know my doctor gave me WelChol after having my gallbladder out and I could have kissed him. Why do they wait so long to give you that. Just read all the posts, glad to hear they found out what was wrong. That gallbladder is a mean little devil, and worse when he's gone. Take care!

If you have stomach pains due to too much fiber, first thing is to drink plenty of water.
Do NOT TAKE Aleve. Take Tylenol instead. Aleve, may upset the stomach even further.

You may have I.B.S Irritable Bowel syndrome.

I have had it a few times. And best to do the following.

Use the Brat Diet for a few days, with plenty of water. Do not take anything with processed sugars
Or sugar free.

Bananas should be completely yellow. No green at all on any part of the bananas.
Rice (Bowled or steamed White rice only plan.)
Apple sauce. No Sugar or unsweetened. All natural.
Toast. Plan dry toast.
Keep drinking water. So if it just overload in fiber, your body needs time to flush it out.

If not better in 3 to 5 days, check to the doctors to see see if it a stomach flu.