firstly, let me say that i havent got that far along yet, so, i cant speak from personal experience, only from how i would feel if the same thing happens to me.
a) get peoples to text you before they come to visit, so you can say yes or no to them, and that way, you can relax more during b/feeding, and that may help your milk
b) call that breast feeding association for help, re-assurance and advice.
c) remember that your baby is new to this as well, so you both need to learn together
d) dont stress over the bonding thing. Sounds abit harsh, but, i remember reading a thread ages ago about bonding, and its not always how it is in the movies. Some peoples take a while to bond. it doesnt make you a bad person
e) if you go to formula - you are not a bad person, nor a bad mother. You are simply doing what is best for you and your baby. You need to be happy in yourself as well, and if forumla feeding is what will make you happy, then a happy mum will (should) mean a happy baby.
f) b/feeding is not for everyone. Sure, it is the best thing etc for baby, but, plenty of peoples raise healthy kids on formula.

ETA - have you thought about expressing? Not sure to much about it, but, perhaps if you can express milk for your baby, and then bottle feed, it might be a win win situation.