Forget about housework and cooking and just sleep when you can.
Remind yourself continually that this chaos will not last.
Remind yourself that you need to rest to make milk for your baby.
Try to not get hung up on bathtimes. If he really does not like being bathed just ‘top and tail’ for a few days.
Do not worry about daytime versus night-time clothes as your baby will not know the difference. As long as he is clean he does not need to be in a new outfit twice a day.
Remember that quite often a calmer pair of arms will settle baby. If there is no one else around simply put him in his cot/Moses basket and then walk away for a few minutes. Sometimes babies get over-stimulated and just want a bit of time on their own to cool off.