Sounds pretty normal for day 3 to me
The first week in particular can suck pretty bad in my experience, but its very much worth it if you can make it past that, as your energy and mood will probably start to improve pretty quickly. Take it easy on yourself, you're doing something very difficult and if you need to rest and heal, then don't be afraid to do that. You can always post here as much as you want without leaving the house. Pizza delivery and netflix (and simple things like taking a shower) has helped me a lot during those times too.