s to you, louis!
The first one is a shocker. It's such a life adjustment! Don't feel bad for feeling down and overwhelmed...it just is what it is. And heck yeah on the time it takes to get a newborn (or any young child) out of the house. I remember I used to avoid errands or going out because it just boggled my mind how long it took to get things ready, get them dressed, get them in the carseat, then out again at the store...
...at the time it felt like an eternity, but now it's just the normal pace of life. You'll get used to it.
Getting out on walks helped me a ton, too. Even if it was just around the block. It's also good if you CAN get out and do errands, or go sit at a coffee shop while baby naps in the sling/carseat/carrier. With just one, you can still go out to restaurants, book stores, libraries, etc. If you're up to it, just dive in to being out there and active again. Hiking with a newborn is wonderful. Life will start to feel normal again soon, I promise.