babybean, bunnygirl, sarahbuff thankyou for your kind words and advice. Feel like I've turned a bit of a corner now. I had a haircut booked for yesterday which I was dreading but I went with my mum and DH and my hairdresser looked after us all very well and made me relax and told me not to panic if he started crying.
Isaac slept in his car seat while I had my hair coloured and cut, DH changed his nappy in the middle of the salon and he and mum kept him entertained til I was done, then I breastfed him while I waited for DH and mum to have their hair done! 
I was feeling super confident after that so we headed to the Trafford centre for lunch. Again Isaac was a little angel and I managed to breastfeed while eating my own lunch with DH cutting my food up for me so I could eat one-handed
He slept while we had a look round the shops and bought him some nice clothes and Christmas presents, then went to my mums for tea. Was really good for my head to get out of the flat for the day and feel confident about being out and about with Isaac.
Last night I fed him in bed wrapped in a blanket which I then kept round him when I moved him into his basket and everything was going great until I was woken up by an almighty cry and switched the light on to find Isaac covered in sick
He was so upset and I had to bath him because it was all in his hair. Fortunately he loves the bath so that calmed him down. Managed to get him in his basket and settled again at 1.30 and wasn't woken up until 5.30 this morning.
The midwife came today. I thought it was going to be a health visitor so was glad when it turned out to be a nice midwife who had been before. I did the usual thing of saying I was fine so DH mentioned I'd had the blues and she was really nice. Told me there was always someone I could talk to and that Isaac was thriving so I was clearly doing a good job. She gave me some info regarding breastfeeding groups, baby massage classes and mother and baby groups which I will be trying to get out to next week.
I feel as though I have been able to enjoy being with Isaac recently rather than just worrying about him. He seems to be feeding longer and sleeping longer now which is giving me time to keep on top of everything.
Thanks again mumsnetters 