Ouch.... Paula that wound sounds terrible. I am sorry you are having to deal with such an infection and with nurses that are bejaving like that.
I hope you get the nearest medical centre or emergency today and get antibiotics...
My GP had told me that BC post op infections need to be treated asap (ideally in under 12.hours from when they initially appear) as apparently makes a massive difference how easily they resolve as to how soon the 1st dose of antibiotics is administered.
Do you have a breast care nurse in the hospital you go to by any chance? If you do might be worthwhile making contact as I have found those ladies really helpfull when dealing with post op issues. They do know their stuff and have been really attentative when I was dealing with signs of post op infection when my surgeon was away and helped me get care real fast even though another medico brushed it off as "that does not look like an infection - give it a day or so before panicking". The breast care nurse did listen to me and my reasons why I was certain it was in fact an infection and helped me get it taken care off before it became too serious. Luckily thanks to her examining me as well and listening to me I based on her advice went to the local GP who pit me on EES and we stopped it.
I do hope you get help for it quickly and does not get too unpleasant :(
Not sure if this is OK for that type of wound - might be worthwhile running it past a GP or a pharmacist but with pussy infections I have always found hydrogen peroxide to work a treat. I use a suringe (no needle offcourse) so I can place only as much as needed directly onto the wound. As soon as it gets in contact with dirt or puss it foams and expels it out of the wound. You just keep on adding more for as long as it will foam and it will clean amd dry up the affected site beautifully. Being thin and water like it gets inside easily and will get to every bit of puss and give you immediate relief
Do it in a bathroom over an old rug or old towels as being peroxide it will bleach anything it runs off on unless washed immediately and considering the placement of the wound you may have trouble stopping some of it drip.
It does not hurt by the way - may sting a tiny bit when used on a completely open wounds but is trully negligable and the fastest way to fully get the puss out - just keep on applying for as long as it foams.
And thank you for clarifying the 'plastic bit' too. I know what dressing you are referring to as I had something like that put on me during surgery and was removed a week later. Mind you that stuck like crazy and a week later surgeon barely managed to peel it off me - took a lot of effort and left me with a nasty rash that would not clear for weeks.