Herceptin & Lung problems?

I'm wondering if anyone has had to stop Herceptin because of lung problems.  I have underlying autoimmune disease which have caused a vasculitis in my lungs.  We knew that going in but it was not bad, and my pulmonary functions tests were fine in 12/07.  Went Wed. for my weekly Taxol and Herceptin (I have 5 down, 7 to go, after having completed 4 dose-dense A/C.) and found that my white count had plummeted and my onc. was worried about my shortness of breath and coughing.  As this is somewhat normal for me, I was not too worried.  But they did lung function tests again and some of my values have really droppped.  Now they want to stop the drugs.  But, it could be a normal flare for me, from my diseases and not the Herceptin.  Unfortunately, there is no way to tell which it is.  But I deperately want to stay on the drugs.  They did a CT of the chest today and I will get those results and see the pulmonologist tomorrow.  BTW, an echo shows my heart is not being damaged.

Sorry to be so long-winded--just felt I needed to give background.

  What I really want to hear is if anyone else is having lung issues from Herceptin.

Thanks in advance to this great group.

Deb