I get nasty keloids after surgeries. Can they show up in my abdomen years after gallbladder removal and cause vomiting and pain?

Keloids. Don't ever cause vomiting. Something else is causing that - best to get evaluated by your family physician.
not give vomiting. If you have keloid tendency some times will form from old scars also , not vomiting . If pain is intra abdominal , not related to keloid foration, see your doctor to find the cause.