Yippee congrats almost, your thoughts were right!
Emz, thanks for the amazing advice! We've had a much better day, he has had two wet nappies and a big poo, which I think is right for his age. He has a really healthy colour to his skin so think all is well. My mum helped me earlier, I feed him and then expressed for a few mins after and the pre milk was flowing so at least I know he is getting some. I think it's just a case of feeding when he needs at the moment, which is sometimes 2 hrs sometimes 3, sometimes 4. I then pass him to DH to wind and put down as he settles better, with me he just smells milk and wants more, this system seems to be working. As of now I will be sleeping when he sleeps as have even trying to but not with much success.
Thanks again Emz as everyone else x