Am petrified of what I might be told

Today is Monday 2 July 2012. I have an appointment tomorrow for the results of a lung biopsy 22.06.12 & PET scan 29.06.12 & my head is spinning, I would really appreciate some advice to help calm my nerves if anyone has a similar experience please :-)

Two weeks ago I went for a control thorasic MRI, I have a long history of bad bouts of bronchitis accompanied with a horrendous, deep, painful cough & last Feb 2011 I was admitted to hospital through ER having woken at 3am withthemost horrific stabbing pains in my left chest (was not ill prior), diagnosed with severe lung & kidney infection, kept on oxygen, intravenous antibiotics & fluids for 5 days discharged after scan they said was fine. Took another week or so till I felt better, I felt brilliant for a while but during the summer I noticed that I was constantly waking up with a sore throat, not every day, but it was a constant, I then noticed that I wasn't just coughing on accasion, but coughing every day. Very dry harsh deep cough which didn't produce phlegm every time, but maybe 3 to 6 times a day. Didn't doanyhing about it as I know I have hyper sensitive airways (do not have asthma), also have had horrible family tragedy followed by another & further issues more important than my stupid cough & constantly feeling unwell, so jusycarried on with life. in April this year itbecame impossible for me to eat or drink without having a major coughing/choking fit, often including severe wretching. This continued for about 6 weeks till it cleared.
However cough has continued day in day out, choking & wretching, so while at Dr's for unrelated issue, mentioned my concerns, she suggested a control scan as had not been done since being released from hospital.
So, 01.06.12 MRI caried out, consultant at clinic told me that they had found something in my left lung that obviously shouldnt be there and to see my GP asap to be referred for a biopsy etc. Saw my Dr that afternoon, was referred for emergency apt. With pulmonary specialist at hospital 10.30 following morning she said she believed it to be a latent infection, however it is on an xray from 2007 that was not picked up at the time, so she put into procedure all the necessary tests urgently and here I am now waiting for tomorrow ! What is freaking me out so much is that PET scans seem to be solely for cancer diagnosis, is there anyone who has had lung spots/scarring/dead tissue, collapsed trachea and has been diagnosed clear after PET scan ? Apologies for long post :-)