Just been reading your thread Daisy, am so sorry you feel so awful. You've been so supportive to everyone on here, I wish I had something to suggest that would help you.
can DH take DS off for the day? Surely they need some time together 1:1? You can then take to your bed, have a bath with DD, and cosy up for a few hours baby-mooning.
Good for you for doing something pro-active and positive about it though. You might be feeling shite, but you are taking control of it - and IMHO that is really, really important! xxx