Re: Feeding all the time
I know you're tired and probably feeling really drained... But the behavior you describe is absolutely normal for such a young baby. The first 3 months outside the womb are often referred to as "the fourth trimester" because the baby is still so underdeveloped (in comparison to the young of other placental mammals), and therefore requires intensive feeding and care. That means you can expect almost non-stop feeding and frequent night-waking.
The best thing you can do about the issues you're having is to roll with the frequent daytime feeding and find a way to maximize your sleep while the night-waking is part of your life. I promise you that your baby will not always feed every 20 minutes. As she gets older, larger, stronger, and more alert, she will be able to get her meals faster (leaving more time in between feedings) and she will also be interested in things other than nursing. Once she discovers what an interesting place the world is, she will spend more time watching it and trying to interact with it, and less time simply hanging out on you.
The level of night-waking you are experiencing is normal and even moderate by some standards- many babies wake far more than yours. Mine did, the little stinkers! If you're not co-sleeping and feeding in the side-lying position, I would try doing that, because it can enable you to feed the baby without waking all the way up. During the daytime, I encourage you to nap with your baby, if possible. An hour of sleep here and there can make up for a lot of lost sleep at night. Finally, I would pick up a copy of Elzabeth Pantley's book "The No-Cry Sleep Solution" for a realistic look at infant sleep and breastfeeding-friendly, baby-friendly approaches that may encourage longer stretches of nighttime sleep.
Still early days, mama! It's going to get better, I promise.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"