Will I be able to function after my TTT?

Hey y'all, I have my tilt table test on Monday and I'm expecting it to affect me quite a bit (I've had the poor man's done twice and failed both times) but I have therapy later in the day and really want to go. We skipped a week bc of schedule shit and I'm going through a lot. It's over zoom so I don't have to go in, but I've had to cancel appointments before due to not feeling well. I know that everyone has a different reaction but do y'all think it will be a day-long thing? I'm going to message her today to say I'll have it and might be too sick to attend but should I just cancel??