OMG you poor thing how awful.
I'm going to ask this...and it's probably been looked at...but have they checked you out for diabetes or any other auto immune disease that might be contributing to your delayed healing.?
Have you considered a naturopath for ideas on anything that may boost your immune system?
Whats happening re your other treatment or is it all on hold?
Have they considered an antihistamine if its fluid not infection causing the issue?