@mlucas is doing a good job of walking you through the Domain and Concern levels. I probably shouldn't've jumped in, so I'm going to let you two keep going. But since I already jumped in, I just wanted to answer your question about the connection between the stories. If my answer is difficult, or doesn't make sense to you, it's probably best to skip over it for now. I just can't help but add my $0.02 because I'm so fascinated with this theory and still super excited about learning about it.
I was answering the first time under the assumption that the city in a war zone/epidemic was meant to be part of the same story form as the cheeseburger story. But @mlucas is right. It could be the same story form, or a separate story form.
As far as the connection goes, what connects one story form to itself is not going to be one concern or one issue. The easiest way to put it, I think, is to say that the Dramatica chart is all about one single problem. Everything on the Dramatica chart from the 4 domains (Activity, Situation, Manipulation, and Fixed attitude) all the way down are all looking at that one problem from 4 separate perspectives. The 4 perspectives are what make the problem look different. So the one problem that Dramatica is looking at is what connects them.
What connects the perspectives is that Situation and Fixed Attitude are both problematic states while Activity and Manipulation are both problematic processes. At the same time, Situation and Activity are both external problems while Manipulation and Fixed Attitude are both internal problems. So the various perspectives can be connected or disconnected because they are internal or external, or because they are states or processes.
Within the examples I gave before, the MC character was trying to obtain a cheeseburger as part of the OVERALL story rather than as part of the MC story. His fear of not having anymore cheeseburgers in his future would have been part of the MC story. I just used that, because it seemed to tie in nicely with the overall story of OBTAINING, but any thing that is a concern about the FUTURE would work there and be tied in as well because they are all really looking at the same problem, just from a different perspective.
I won't even begin to speculate about what would connect two separate story forms for now.
Again, my answer may be too technical. If so, my apologies, and feel free to skip it and move on. And heck, i'm still learning, so parts of it may be wrong. I'm learning right along with everybody else, if @mlucas or anyone else on the board want to correct me, please do so.