HI - My 11 year old son has been experiencing vomiting around lunch time sporadically for about the last three months. This happens very randomly, may go a couple weeks with out it happening and then twice in one week. It may happen right before he eats, during lunch or after lunch. Seems to come on somewhat suddenly but after vomiting he feels better for the rest of the day. Maybe a little more lethargic than usual. No problems at school and this has happened with the school lunches and lunches brought from home. He is also on medication for ADHD and we have changed medications 3 times thinking the med might be the cause of the vomiting. Any ideas?