I promise you that it does get a lot easier. Those days to me are such a blur! It was even harder because DS refused to take naps unless he was right next to me. I remember holding DD on my chest and patting her bum so she'd sleep/keep quiet until DS woke up. The good thing about that is that it got them on the same nap routine.
A carrier really helped in those days as well. Just do anything to get through the days. There will be days where your toddler will watch TV all day because you'll struggle to leave the house, and that's okay!
Pop your baby in the carrier/pram and take them both for a walk around the block, take them to the park for an hour or two. Like I said, the first few months are about survival so do what you have to do.
I used to ask my mum to take DS once a week/fortnight. That really helped me because it gave me a chance to feed DD and sleep when she slept. If you have anybody to give you a hand, don't be afraid to ask them.
You've got this mama!