I have an overactive imagination, and also a social anxiety over talking to people on the phone. Between the two, I can create a great deal of angst where none has previously existed.
Take for example, my hotel reservations for Twangfest. I called and booked a room, a double room, as it happens, because they didn't have any other kind set aside for attendees. That was fairly traumatic, because I don't do phones, but I managed to deal with it at a point where not having reserved and paid for travel plans was probably going to result in the cancellation of my vacation.
Then I went and found myself some roommates, because, after all, I don't need a whole double room all to myself, and I'd rather not pay for it, either. I knew I needed to phone (social anxiety alert!) and add all of those names to the reservation so that they could check in if they got there before me, but somehow I took a small throwaway comment I made on the first phone call - about really only needing a single - and (overactive imagination alert!) built it up into a nightmare scenario in which they had moved me to a single without telling me and there wasn't room for all of the people I'd promised space to. I'd even imagined in my head all the things I would have to do (and they all involved more phone calls) to get them reservations in other hotels, and the tearful, apologetic emails that I would write to them trying to make up for my screw-up. The more I put off the dreaded phone call, the worse the scenario I was imagining became, thus encouraging me to put off the phone call even more.
I finally phoned this morning, and, of course, everything was perfectly fine, they added the names to the reservation, and other than the operator apparently being either deaf or stupid, all went well.
So, basically, I've been stressing myself out for three weeks over problems that I made up in my head. Because, apparently, I don't have enough problems in real life to worry about.