Constantly eating

Im 7 weeks pregnant today and for about a week and a half now i have been feeling hungry constantly, im really starting to worry, eg i has eaten my dinner today and about an hour later i was hungry as hell & my belly was hurting very bad, i feel very bad for eating so much but i can't help it and when im at work and i start getting hungry & i have to wait for my break i cry, i feel unwell, dizzy, stomach hurts very bad, i start to feel sick, this is my second pregnancy and i definitely wasn't eating this much in first trimester, i understand i am growing a baby but is it normal to be eating this much. On a normal day i eat probably more than 5 times a day, do i need to worry