That probably should have been "non small cell lung cancer." Maybe they are still unsure whether it is actually cancer, but they did a biopsy they should know the result. "Neoplasm" is one of those jargon words that means something when doctors use it to each other, but never should be dropped on a patient without an explanation. You will want to see a specialist--an oncologist. Your family doctor may be able to recommend a good one. You may also want a second opinion. That might best be out of town. Here is a list of the 100 best cancer hospitals in the US: http://health.usnews.com/best-hospitals/rankings/cancer You might note that the Cleveland Clinic is #6 and that the University of Michigan and University of Chicago both rank in the top 20. The University of Michigan advertises a service (I'll try to find the number) where you can call and speak directly to an oncology nurse whether or not you are a U of M patient.
There may have been many explanations as to why you were treated the way you were. But, that still desn't make it right. Someone should have told you more and not kept you hanging around imagining what can go wrong. Knowledge is the first step in overcoming fear.
And, it is perfectly normal for you to be fearful--particularly at this stage. You've taken the first steps in overcoming that fear. Make a list of things you are going to do on Monday--such as getting an appointment with an oncologist--and then try to forget it for today. That may seem difficult, but there's little you can do until then.