Wbat kept me so busy was basically the fact that there was another person in the house who couldn't do anything on their own. So feeding, cleaning up after That, going to the toilet and cleaning up, dressing, sleeping. Plus babies like being held and cuddled - why wouldn't they, they've just come out of an environment where they were held 24/7.
On top of just having to do everything for the baby, you have more of every day housework to do. Not just washing clothes for the 2 adults any more, due to the amount a baby dribbles, possets and shots on itself you apparently have to wash the equivalent of a tiny 5 aside football team. Every day. Plus nappies (if reusable). Then there's emptying bins due to nappies. And tidying up clothes and toys and general stuff babies attract.
Doing all the baby stuff also feels more difficult when night sleep is broken. And after you've actually given birth too. It's like running a marathon, having a half hour sit down then being asked to run another marathon. You're knackered from the first one but no time to recover.
BUT. After a couple of weeks you get used to it. You start to get the hang of what you are doing with feeding and nappy changing and so on.
Drop your standards - either give up ironing and cleaning windows yourself - or get someone else to do stuff. Reduce the amount of things that "need" to be done so you have less you feel you have to do. Easy. (I don't iron. Never have. It probably saves me lots of time.)
Also: don't underestimate the amount of time you want to so end just sitting cuddling the baby. It's wonderful. Having this tiny wee person in your arms, snoozing or feeding. Ah, lovely. I spent days just holding and cuddling. A sling also helped.
The period of time when you feel like you have no time to shower or brush your hair lasts for a fairly short amount of time. You get through it. You figure out what is and isn't achievable in a day and you figure out what you do and don't want to do (cheerio ironing!).
It'll be fine.
But tell your DH that he has to do his fair share of housework and baby wrangling too. If that means knocking the hobbies on the head for a bit, fine. He knocked you up so he needs to accept his life changes too.