It is normal for non-diabetics to spike above 10 depending on what they ate. Half a liter of regular coke contains about 50g of fast acting sugars. McDonald's food is laced with sugar in the buns, sauces and dressings. Most people spike on these foods because the body can't cope with that amount of sugar so quickly, so I'd say for those food choices, it's fairly normal. I'd be more concerned if you had a fiber and protein rich lunch with a diet soda and your bloodsugar rose to 10 or higher. That's something a non-diabetic doesn't spike on generally speaking.
Stress is also known to increase your bloodsugar levels because of cortisol release in the body. When I deal with insomnia bouts or panic attacks, my sugars tend to go through the roof. That's not diabetes specific, that happens to everyone (except I don't make enough insulin to deal with it so I shoot way past 10 if I don't inject).
I recommend taking a step back and breathing in and out. You've gotten more tests to determine if you have diabetes than some diabetics get. The results were negative. Unless you're experiencing the classic diabetes symptoms (always thirsty, peeing all the time, slow and lethargic, blurry vision etc.) then I don't think you have anything to worry about. Nobody can predict whether you'll become diabetic or not, or which type you'll be, but you can take care of yourself now and live life happily and consciously all the same!