Hope everything is ok and it was just a scare that passed.
I feel like my golf ball sized lump grew in an extremely short period too... not overnight though.. more like over a month or two? My oncologist was guessing my 5cm mass grew in the last 6-9 months...
I was also put on antibiotics initially before the biopsy results came back because I was feeling a slight pain and I was convinced it was an infection of some sort...