x-ray shows possible signs of lung cancer- breast cancer recurrence.  I was diagnosed with bc in 2-'07.  I had a mastectomy..left breast.  I was HER2+.  My treatment was 4 mos of chemo and 1 yr of Herceptin.  The margins were clear and no lymph node activity.  Doc gave me 85-90% prognosis.  He's been doing blood work every 3 mos.  cbc and chem panel.  Never gave me the ca-125 test and did an mri on my right breast.  I had the tissue expanders placed in Jan. '09.  I had those removed and replaced 3 wks. ago.  I was not feeling good last week.  I was having a lot of pain inhaling, as if I had been running a marathon in really bad air conditions.  Headache and fatigue as well.  Went to urgent care Sat. they gave me a breathing treatment, and inhaler, then an x-ray before I left.  My primary care doc. called in in Mon. for an appt.  He told me I might have lung cancer.  I asked how did he know for sure.  He showed me the white spots.  He said they would most likely do an pet/ct scan and possible biopsy.  I am scared to death, believing that a lung cancer diagnosis pretty much means death.  My doctor said not necessarily.  His mother in law lived 16 yrs after diagnosis.  Should I insist on a pet/ct scan?  Help!!!!