Post natal depression

First, congrats on the baby! Second take just a couple days, log not only your food but REALLY what you're feeling, if it seems like more than just a funk, talk to your obgyn and soon. It's not a one size fit all, how to take care of ourselves and all who rely on us. So don't feel bad about feeling bad. Pick one thing today, just one that you WILL do today, focus on it. If you take the lil one for a long walk in the stroller and the dishes sit in the sink..so be it:) Have a great day!

Since this has been going on for weeks, talk to your dr or find a therapist or psychiatrist, whatever is easier for you. The sooner you address the problem, the sooner you will start feeling better. It is a great step that you acknowledge something is off, time to seek help. It is very common, do not feel bad or ashamed and it is easy to solve it.
In the meantime, until you can get an appointment (not instead of an appointment), forget chores that are not necessary to survive and ask help from whoever can help (husband, friends, neighbours). Even someone bringing a meal, or keeping an eye on the baby so you can have a bath in peace, or a nap, can make a huge difference.
Also force yourself to get out of the house. Put the baby in a carrier or stroller and go for a walk. If there is a park, playground etc in your area this is a good destination, as it could also help you meat other parents and talk. Or you can set as simple goals small treats for yourself, like walk to get an ice cream, a cup of coffee, a book from the library etc. If you still fill very out of shape, start simple, with just walking a block or two, and gradually increase distance. Not only walking (or any other exercise) will help you feel better, but also being outside helps a lot.