hmmmm..... this sounds very familiar to what i'm going through with lucy at the moment.
During the day she is very unsettled / nad like yours cant get into a deep sleep. when she's awake she thinks she has to be feeding....so she spends a LOT OF TIME on the boob.
i cant settle her myself without feeding her because she smells the milk and she knows that i have what she WANTS! I put her on the dummy after about a week from birth..... but even then i cant settle her with that. Her dad can, and my mum...... but still, she knows that i can offer her more than that. LOL
I've left her to cry..... sometimes for 10-20 mins...... but thats not really because its what i want to do - more because i dont have a choice as im cooking my kids' tea - or eating my tea myself. she'll often cry her self to sleep, but on a few occasions i've nursed her as soon as i've wolfed my dinner down..... and she's been crying SO HARD that her whole body is still shuddering with heart felt sobs even when feeding off me - and that makes me feel crap. it also makes me feel crap that she cries herself to sleep when im too busy to see to her...... but i just tell myslef that it doesnt hurt to leave them to cry!
she has one formula bottle a day (so dad can join in with feeds) and she is a different baby. she will go 3-4 hours before wanting feeding again, and at night time she will go twice as long! she is such a good baby on the evening / night time.
dont get me wrong - she's good during the day, just very demanding with her feeds. breastfeeding is a fulltime job.
however - you have to remember that your DS is only 5 days old. and although your milk should be in now - your supply is still building up..... and the thing with breastfeeding is taht we have to feed on demand. MW told me that babies shouldnt be made to go any longer than 2-3 hours at a time.
The more your bubs feeds the more your milk will build up - and the more content he will be.
stick at it - it gets easier.......

Hayley & Lucy (3+2 days)