Hi smk84
Day 17 was the day when I had a complete meltdown and phoned La Leche League, cried uncontrollably down the phone at the lady, and then got put in touch with a Peer Support lady through the hospital. It was the best thing I ever did, and I ended up bf until DD was 9 months old.
She was a comfort suckler, she would happily suckle 24/7, and I thought I had every problem going. I was convinced that I didn't have enough milk, because I just couldn't seem to keep up with her demand. I did the same as you, took it one feed at a time. We did have a tin of formula on standby, and I just went into each feed thinking "well, I'll do this feed, but if I can't handle doing the next one, she can have formula." but she only had formula for one bottle, at midnight, so that DP could feed her and I could have a few hours unbroken sleep.
With hindsight, I didn't do myself any favours giving that one bottle, because even though it enabled me to sleep, it does also affect milk production. Your baby is feeding constantly to encourage your milk production to increase, it is so tiring I know, but it really will calm down and get easier.
A friend told me "I tried to bf but had to give up at 10 weeks" - I remember 10 weeks feeling like it was a hundred years away! It's not though. If you are determined, you will do it. I firmly believe that it is sheer bloody-minded stubbornness that kept me going, with encouragement from the peer support lady.