Hi,.
I remember being so scared for this test. I mean, they were putting something down my throat. Everyone assured me it wasn't bad and sure enough, I was sedated and didn't feel a thing...was talking to the dr, and then woke up.
You will need someone to take you and will want to take the day off work (or from after you test time) as you'll be sedated and will feel tired for the day. Next day you should be fine. I didn't have any other after effects.
Good luck.