I'm glad that you're finally getting this test done, although I completely understand why you're nervous about it. I agree with Elizabeth that you're taking the right steps to figuring out the cause of your symptoms. Even if something is wrong, you'll be able to address it much better if you know what it is!
Did you doctor explain how the test is conducted? At least it doesn't seem like you'll have to fast for a long time.
Please keep us updated after you get the results!
Sending positive thoughts, Karina (team member)