Are you saying you've only started getting this problem after having your gallbladder removed? Never before? Are you on medication new to you since then? Because the gallbladder is so involved in digesting fat based foods, this could be nutritional, it could be drug side effects as well. You aren't taking a new allergy med, for example, are you? They can be very speedy.
Dunno. Seems odd they would appear out of nowhere. But matters not, really. Some good stress and anxiety management will help you, along with getting some good exercise most every day.