"I've been sleeping better since I decided to get a second opinion, but  there's so much info to absorb, I'm feeling rather overwhelmed. I'm sure  that's normal, but somehow that doesn't make it an easier or make me feel any  better." [Erica] 

The next things you do are ask for your copy of the pathology report and the operation report, and any correspondence between the doctors about your case.

You probably have had a spiral CT scan of the chest, abdomen and pelvis with and without contrast.  You will need that report.

You will need reports of any laboratory test results, or other XRays or tests.

You will also need a case summary of your whole medical history, not just the cancer.  This is needed for a referral letter, anyway, and your primary care physician/GP should be able to provide one.

[You are entitled to all of this information.  See &&url section.]

Take the pathology/histology report and the operation report and the CT scan report.  These are probably the most important in terms of understanding the cancer.  But in order to understand these reports, you will have to understand a LOT more about the disease, and how it works, and what significance the words have.
 
You will have to translate the operation report and the pathology report into English from Medical Jargon.   You can go to the library or your doctor's office and use a medical dictionary, have the surgeon or pathologist or your GP explain it to you, word for word, or have a friend in the medical field help you out.  In any case, write the English translation down separately.  

There is a MOUNTAIN of information to understand.  But you can do it.  It just seems a lot... in a few weeks, you'll be able to teach other people about it [likely including your GP].                

This is not a TV serial where everything is resolved within an hour.  It will take some time.  The important thing is that you are facing it... not hiding away.  Doesn't mean that you have to live with it every minute of the day, though.  And being a cancer patient doesn't mean you're going to die from it.  Knowledge and perspective make a big difference. 