33 and scared

I am 33 years old and I had a hysterectmey (if i spelled that right) almost a year and a half ago.  I quit taking my HRT due to them making my hot flashes way to intense.  In april of 2012 I went in for my annual exam and my doctor had found a lump in my left breast.  She ordered a ultrasound and it came back that I just had really dense breast tissue and was told not to worry.  Over the past month or so my left breast has become painful swollen and I have been experiencing discharge.  I went back to my doctor and she brushed it off as hormonal and said that if it would make me feel better she would order another ultrasound.  I was not happy with the way that she treated me, so I found another doctor and she did a exam on me and found my lymph node was swollen under my arm on my left side.  She immediatley ordered a mammogram along with a ultrasound.  She did tell me that since I am young and my breast are dense that those two tests would probably not show anything, but they were a part of the process.  I had the tests done 2 days ago and sure enough they showed nothing.  I followed back up with the ordering doctor and she said that she would not stop until we found out what was wrong.  Today I am going for a breast MRI, and she is sending me to a breast surgeon.  I am really exhausted and have been for about a month.  Should I be this worried??  HELP!!