Crying it out.....again

Over the course of the weekend Kendall didn't sleep past 6am and was up multiple times every night. However, this morning she woke up at 4:45am seems just a little early to me. It feels like I have an infant again.
This may sound harsh but she is so stubborn and such a manipulator and she knows what to do in order to get a bottle in the middle of the night. She has been waking up several times a night and she starts whining until progressivly it turns into crying. I admit it's my fault for giving in and giving her the bottle but only because its the middle of the night and i just want to go back to sleep.
This morning after our early start while i was laying in bed listen to her cry and scream at me for ignoring her, i decided it was time, yet again, to let her cry it out. It is really hard to let her do it since she shares a room with me and she can stand up and see me from her crib and she just screams at me cause i am ignoring her. I think for the next few nights i will be sleeping on the couch with headphones in so i can't hear her. It makes it a little easier not being in the same room.
The last time i had to have her cry was 2 hours long and I eventually gave up and gave her the bottle. It gets very frustrating when night after night she does this. She is tired and crabby, I am tired and crabby and it's just not a lot of fun for either of us. Hopefully it works this time, or it looks like i may have to move back into the spare room for a while to get her back on a good sleeping schedule.....again.