My son has cried intensely 2 nights in a row just before bedtime. It seems like it might be gas. He cries very intensely for about 30 minutes and then passes out exhausted. He has never had this kind of gas before. He has been on prevacid solutabs for a few months and he is on gentlease enfamil formula. Nothing has changed but he seems to have developed severe gas only in the early evening. Any thoughts or suggestions? He is on oatmeal, but it seems unrelated as we did not give him any yesterday and he had a gas attack.