Thank you all, so much.
I was very much brought up in the school of
"Can't go to school today, Mum, I've had my leg cut off"....."Never mind" says Mum "You've got another one, off you go" 
so I truly wasn't looking for a sympathy vote, but your kind words and empathy honestly have cheered me.
I've just tried to send an e-consult to explain the situation and request an appointment with senior partner/GP but the surgery has switched to a new system and only takes submissions between 8 and 10.30am so I was too late today.
So here's my plan, see what you think.
I shall go to my appointment tomorrow with said nurse and tell her that I need to have a conversation with her about what happened last week. I shall go through it all with her and then TELL (not ask) her what route I now want to take, which will be an appt/meeting with GP (preferably partner) and Senior Nurse to review my treatment so far and discuss treatment from now on with possible referral to specialist wound clinic (there is one in my area) and ask that she please arranges this, while I am there. I shall also diplomatically (not my strong suit, but I'll give it a shot) explain that by her listening to me and doing what I have asked will potentially avoid me making an official complaint. It will be up to her to explain in her own words what happened last week and is a way of making her accountable rather than me having to totally play being the bad guy.
Does this sound like a sensible idea?
I'm prepared to work with the surgery on this because generally, it's an excellent surgery compared to the one I came from prior to moving here. But I can see from your replies that I have been too compliant, not my usual MO, but we tend to think we should bow to what we assume is superior knowledge when it comes to medical matters.