Hello! Thank you for the query. When vomiting, abdominal muscles need to push your abdomen really hard. If you have been vomiting few times during this 2 hours, it could overload abdominal muscles. Such hard muscles work leads to muscles sores. You could have such pain before after some exercises. This is very normal thing and does not have to indicate any problem. Such pain should go away in few days. Liver or pancreas trauma due to vomiting is hardly possible. Liver trauma usually does not hurt. Internal bleeding is the only symptom (what gives weakness, pale skin, accelerated heart rate). I suggest you to wait few days and see if the pain will go away. If not, abdominal ultrasound should be done. Hope this will help. Regards.