I posted about this on my postnatal group a while back and was quite reassured by the replies. It seems I'm not alone (joint pain on waking in particular, all over the body, but especially thumbs and feet).
Anyway - thing is I have to see my GP each week to monitor my PND, and mentioned the aches and pains this week. She thinks I might have arthritis and will be ordering tests in a few weeks' time if it doesn't clear up spontaneously. (I am assuming it won't since I've had it well over a month now.)
I suppose I just want some reassurance from other Mumsnetters about this. My DH has MS and I'm not sure if I could cope with me having a chronic condition as well!