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I'm not sure I have anything to share on telling family and friends about your diagnosis. Lexie makes a good point: you don't have one yet! I'd at least wait till you did because so many other questions become answerable once a diagnosis is determined. A reveal now might needlessly heighten uncertainty and lung cancer is already uncertain enough.
I do like your priorities: travel first then complete diagnosis. I wish I held that attitude when I was in the diagnosis and treatment zones. I put my life on hold and ended up wasting 3 years fretting about lung cancer. I'd forgotten the purpose for treatment is extended life and I was wasting my extension! You are not and I say well done!
Stay the course.
Oh, and one other thing--you do have US to talk to. No matter what comes your way, chances are that one or more of us have Been There, Done That. We know how anxious it can feel waiting for tests, results, treatment. Family is great, but it's also great to be able to share with people who (a) get it and (b) you don't have to worry about upsetting.