Considering supplementing but feeling guilty.

I've been breastfeeding since my baby was born. Things have been going alright except I'm not getting any sleep. :( I'm soooooo tired I just want to cry. Every time I try to pump for my husband to give baby a bottle (so I can nap) nothing comes out! It's so irritating and I'm exhausted. I'm thinking about supplementing... Maybe one bottle a day so I can get a little break. I feel guilty, not because I think there's anything wrong with formula- just that maybe I should just put my babies needs before mine. Have any of you ladies had success breastfeeding AND supplementing ?