Aiyoh, week 5 and the nausea is already here, that's quite early, but not uncommon in second pregnancies sometimes! Try eating small, frequent meals (even just crackers or plain rice) before you feel too hungry, stay hydrated with small sips, and ginger tea or sweets can help some mummies. Wishing you all the best with this pregnancy, and do check with your gynae if it gets really bad ya.