recurrance after only 18 months of original diagnosis

Im at it again!  I was diagnosed in september of 2014 with IDC stage II because of size of tumor.  I did not have lymph node involvement.  I had a lumpectomy and started chemotherapy.  I did 4 rounds of AC 12 rounds of TAXOL and 17 rounds of Herceptin.  I was scheduled for my last herceptin treatment next week.  I also completed 7 weeks of radiation.  My oncologist told me two weeks ago that we overkilled this cancer and he is certain i will never get it again.  He said they caught the disease early and i was a lucky one.  I then told him my breast had become tender and i had shooting pains.  It was also turning red on one side.  He thought it was a side effect of radiation.  I agreed.  That night i couldnt sleep and i decided to travel and get a second opinion and asked for a biopsy.  I have now been diagnosed with IBC and will start the PET scans and MRI's and all the other lovely test tomorrow. 

I havent even finished treatment for the first cancer yet.  If you have a concern keep pushing until you get an answer.  if i had brushed this off who knows how much longer it would have taken to get a diagnosis.