Mine are 2.3 and 5 months and it's bloody bloody hard work.
I agree with whoever said that visitors to my house are shocked by the relentlesness and sheer physical slog of it, which always makes me feel a bit better .
We cope by making sure we go out most mornings, even if it's just for a walk round the park. I find if I've not gone out for a couple of days, the thought of getting them both ready, sorting out the double buggy etc. fills me with horror, if I do it regularly it doesn't seem as bad.
I also try and do chores in the evening, to minimise stress during the day, and prep stuff like lunch, even putting milk in dd's beaker and sticking it in the fridge for breakfast time etc.
DD loves arty crafty stuff so I've got a little table set up for her with paper, crayons, stickers always available, then if I'm feeding DS she can play at her table (or watch cbeebies )
Bed for 8pm at the latest helps here too.
I did what mrstittlemouse did - DD hit 1 year old, I started to feel normal again, initiated sex (just once!) and bang - DS arrived 9 months later.
I live for DH's holidays - it feels like such a relief not to have them both by myself all day!
I return to work in 10 days, 2.5 days a week, so I'm hoping some of my issues will fade away - will be bliss having uninterrupted conversations and poo'ing in peace! The 6am alarm call on 4 hours sleep may kill me off though .
In response to your OP the Baileys has made me waffle - I think it gets easier - we're doing a fabulous job!