1. Passing out sucks, but it's usually very brief and preventable! I worry about passing out a lot because I have before, I have low blood pressure, and my blood sugar is usually really out of whack. Eating consistently throughout the day and drinking water are great ways to prevent fainting. If you're panicking, I think you're more than likely to hyperventilate than pass out, and hyperventilation can be treated by simply breathing into a paper bag (or breathing through pursed lips, breathing into cupped hands, trying to breath by filling up your belly rather than your chest, etc.).
2. Diabetes is a big fear of mine! Usually it flares up when my fingers or toes start to tingle, and because I keep thinking about them tingling, they keep tingling, and it turns into a vicious cycle. It's basically always a pinched nerve. I like to have something with me to eat or drink when I'm out though, just in case my blood sugar does drop (since, again, it's super out of whack).
3. Red lights don't bother me, but I get nervous in heavy traffic. I start to feel really stuck and stranded. What helps is thinking about things like, "Well, there's a shoulder, so if I need help I can get it," or, "I've got my cellphone, so if I need to call someone, I can."
4. I'm really afraid of this, too. Just the other day my washing machine smelled strange, and when I called my mom and told her about it, almost the first thing she said was, "You're not going to have an electrical fire." Part of it for me is that I used to live in an apartment building with extremely sensitive fire alarms. I made toast once -- didn't even burn it -- and the stupid thing went off. Needless to say, it was the same for everyone else in the building, so fire alarms were going off virtually every day. Though, in the six months I lived there, there was never actually a real fire, so I suppose there's that!
5. I'm not really afraid of nervous breakdowns, so I can't really relate.
If it helps any, I've had some pretty spectacular ones, but I usually bounce back just fine after some R&R?