Mass in Anterior Mediastinum & a Lung Nodule & docs on vacation

Was hoping someone might be able to share their experience or make me feel a little less on my own since my oncs are on vacation and the thought of going another week or two with this uncertainty feels like it may push me over the brink...  I just need to be able to share with people who understand--and who appreciate how difficult the waiting is!

A few weeks ago I was in for my herceptin infusion.  I'd been having a lot of trouble breathing for about 6 weeks or so, but by that point, it was worse (still is).  Not like when I have bronchitis or pneumonia, but like there was/is a weight on my chest and I feel like I can never get enough air or take a deep breath.  After examining me and saying my labs weren't very good, they didn't give me the herceptin and sent me down to the ER instead.  They said I needed blood and that might help, but that it seemed like there was something else going on--maybe a PE since I just had surgery last month and I'm on tamoxifen. 

They did a chest CT in the ER and quickly ruled out a PE, but said that the scan showed "some things" and they wanted to admit me.  I was taken off guard & declined.  In retrospect, I probably should have stayed, but I'm sure you all understand not wanting to!  Plus, my little boys were upset that I wasn't home & didn't want me to have another hospital sleepover. They said that it appeared that I may have a partially collapsed left lung and that I either had pneumonia in that lung or there was some other process going on in there or maybe both.  They also said there was a small nodule in the lung.  For the rest of the details, the dr. said I'd have to follow up with my oncologist. So they kept me there on oxygen & monitors for another 5 or 6 hours of observation & sent me home with an antibiotic in case pneumonia was contributing to my issues.  And told me to follow up with my onc asap.

My primary oncologist (at the hospital) was (still is) away, so I couldn't see her.  That left my cancer center onc--and I wasn't even sure I wanted to tell him I had been in the ER.  So I waited a week to see if things improved with the antibiotics (they didn't) & decided to pick the CT disc and report up to share with him.  

Of course I read the CT report in the car and saw that in addition to what they said in the ER, there was also a 2.2 cm mass "that could be of lymph node origin" in the anterior mediastinum.  When I was in with my onc, he said that since the ER report said "unchanged" after it described the mass and lung nodule, that they were probably ok.  One word made it all ok! 

When I got home, I googled it and thought maybe he shouldn't have been his usual dismissive self, especially since I had chest wall invasion and a 10cm+ "area of involvement" with multiple tumors at diagnosis--features that seem to make the anterior mediastinum not that uncommon a site for mets.  But I figured that since it was "unchanged", maybe it was ok.  But I just didn't feel right about it, so I thought I'd get my reports to set my mind at ease.  I got a copy of the ER report which says that my last chest CT was in 5/2010, so this should be what the "unchanged" relates to.  But when I got the 5/2010 report from a few weeks after diagnosis, it says my lungs are clear and there is no mention of the mediastinum.  I also had a chest CT in Aug. 2010 (different hospital) to see if chemo made me ‘operable', and a planning CT for radiation this January, so I decided to get those too.  January's doesn't say anything, and the 8/2010 report clearly states that my lungs and mediastinum were clear.  And free of lymphadenopathy.  So maybe the "unchanged" on the ER report was a mistake? Or maybe it really was there on the 5/2010 CT and they failed to mention it in the report--and it disappeared with chemo last year & is back now?

I called my onc's nurse to relay what the reports said on Monday when I got the last one, but she said he's on vacation for the holidays now and my hospital onc is still gone until the middle of Jan.  I generally don't speak up with my doctors, so being persistent with something like this is fairly uncharacteristic for me, but that's part of the reason why I'm here...  Should I let this go and not worry about it??  I don't want to seem like a hypochondriac, but I am concerned, especially because I'm still having trouble breathing and get winded from just walking around the house.                  

Has anyone had any experience with an anterior mediastinal mass that turned out to be nothing--or something?  Or the same for a lung nodule?

Thanks & sorry for the loooong post.  It wasn't the quick one I intended!