Oh no! I am so sorry.
I really, really wish that the information about breast feeding and formula feeding was more balanced. I hear a lot of mothers like you who feel like they've failed if they can't breastfeed, or like they have to break themselves to do it, because otherwise they're bad moms.
Some recent research suggests that the benefits of breast feeding have possibly been oversold. There's an article about it at http://www.slate.com/blogs/xx_factor...aggerated.html
(I think there are links to the original research in there, if you want to check it out) - when sibling pairs where one child was breast fed and one was bottle fed are compared to each other, it does not appear that breast feeding made a difference. Breast feeding is wonderful, but in many situations, there are good reasons to use formula. Yours sounds like one of them.
One of the awful parts is that sleep deprivation and exhaustion are major contributors to PPD, which it sounds like you're experiencing. I feel like, you poor woman, go see what happens if you get a good night's sleep. Turn off the alarm, put down the pump.
If, in the morning, you want to put your baby to your breast and have her nurse what she can, sure, that's fine, but if not, that's fine too (breast and bottle are seldom all-or-nothing decisions). You deserve to be able to rest, take care of yourself, and care for your baby in a way that leaves you with energy to enjoy her. I hope that people who love you have been telling you this. The people who don't love you shouldn't be taking up your time giving advice.