Some LC's will disagree with this but this is what worked for me. An LC showed me this with my first son (13 years ago) I have flat nipples or I should say I had flat nipples. After nursing for years with my two older boys they are no longer flat. Try squishing your nipple together and shoving it in your lo's mouth to get as much as possible in there. Start like you are hand expressing and when you sqeeze together tickle the baby's mouth until he opens wide then bring baby to breast...not breast to baby. Since you have been giving bottles you might want to try with baby sleepy or in the bath tub. There are a lot of ways to get the baby back to breast. You need to relax as hard as it may be. You are probably tense when you are trying because in the back of your head your saying "please latch" just take a few deap breaths and try to think "if baby latches great, if not we will try again later" keep trying! It may take some time. Go to LLL meetings. The women will help you. Being around other nursing mothers will help calm you as well.