Hoping that your test went well. I believe that is one of the tests I will be having at Mayo next week. That's where they have you return every so often for up to 48 hours to see where things are at, is that right? Maybe I'm thinking of something else. I do know there are scrambled eggs involved!!
I really hope that you get some answers, and that the test itself was ok. I would say that it's pretty normal to be nervous or scared about it. But, you have to try hard to not let your mind run off to the worst possible outcome. All you can do is stay in this moment, right now. You cannot predict the future, and if you let your mind get carried away, you'll end up a whole lot more stressed out. I know it's much easier said than done, but try to find things to take your mind off of it, distract yourself whatever way possible (as long as it's not going to hurt you!!). And be sure to ask a lot of questions when talking with your doc, tell him/her your fears. They may be able to explain things or tell you things that will help to put your mind at ease.
If you're comfortable sharing, let us know what happens. If there is something going on, it's much better to find out about it sooner rather than later, so you can get treatment before it gets worse. Hopefully though, you've nothing scary going on, and you will be very relieved when it's over.