I have horrible sickness at 13 weeks and can't stop being sick! It's just come on in the past 2 days for some reason, I think it could be a migraine as I have a bad head as well. I have always had a phobia of being sick out food. With water or fluid I'm ok but when it's undigested food I panic a lot and get really grossed out. I'm so hungry but so nauseas so obviously I want to eat but not if I'm going to be sick it out! How long after eating food does it take for it to digest and not come out if being sick?