What Bertie said.
And try watching some of these for hints on babies feeding well (Good Drinking and Really Good Drinking are what you want to see NOT Nibbling!).
Don't forget babies 'nurse' for reasons other than hunger so if you think he can't be hungry again, remember he may not be nursing for food, he may be getting comfort, closeness to mum, warmth, cooling down, reassurance he's not alone and tiger food or help regulating his breathing/heart rate instead.
Can you ask for a referral to the Infant feeding co-ordinator/Specialist BFing MW as bfing can be uncomfortable or even a bit painful (should subside though quickly after baby latches on) - hurting like buggery isn't good. Have a chat with your MW in the morning about how things are going if you are feeling unsure or worried about anything. You can always call the Maternity ward if you get really worried/need reassurance.
On the pain front:-
Has baby done 5 wet nappies and 2+ yellowy poos (moved on from Meconium type poos) today?
Are your nipple nipple shaped (might be a bit longer than when they went in) at the end of a feed or are they wedge/lipstick shaped or squashed looking?
Does baby can sucking pattern from the start of the feed to the end? Moving from a more frantic suckling to a rhythmic suckling with small pauses (the pause is a mouthful of milk being swallowed), perhaps fluttering/tickly suckling at the end?
Crying all the time is normal too, but speak to your MW if it doesn't ease off soon.
Congratulations on your new baby boy 