So beginning of May 2023, off I go to MHHS in the Texas Medical Center (TMC) for my TTT.
DM actually also needed to have a medical appt elsewhere in TMC, and she doesn’t like driving in Houston (and TMC is one of the most confusing places in Houston to drive), so she scheduled it for the same time as my TTT. We can ride together and if things go sideways, she can drive home. Probably. Maybe. 
This is the gist of how it works:
During the upright portion, I start to experience mild nausea. Then they give me the nitroglycerin (which mimics being in a warm environment), and it’s game over. My nausea shoots off the chart and the room starts spinning and I’m out.
I come to in a cold sweat, having been lowered back to a flat position. But I still have curl-up-in-the-fetal-position level nausea and it’s not letting up. My head is Very Unhappy. From my perspective, it feels exactly like the episode that happened back in September. (FWIW, my KN95 went AWOL at some point there.)
They tell me they’re calling Neurologist #1 with the results. They get off the phone with him and say he’s actually going to come over from his building across the street.
I’m still a mess and not improving at all. And the small part of my brain that’s still functioning realizes DM will have an extremely difficult time finding her way to me on foot to get the car keys, let alone figure out how to navigate my car from the parking garage midway between our 2 appts to pick me up.
Remembering how it played out previously, I ask if it’s ok if I force myself to vomit. “Well, yes, but it won’t help. It’s not the contents of your stomach that’s the problem. It’s your neurology.”
Well, it does help. I won’t pretend to know why, but it was what my instincts were telling me. “Huh. I’ll need to remember that. It shouldn’t have helped, but it obviously did.”
I’m sort of coherent by the time Cardiologist #1 comes barreling in. “They gave you the wrong TTT. They gave you a basic one, and you were supposed to have the advanced one done by Cardiologist #2 personally. We’ll get you re-scheduled and make sure you don’t pay for this one.”
But then he gets waved over by the staff. There is A Discussion and much Pointing at Data on the reports.
He comes back, takes a hard look at me, realizes I am in no condition to have a discussion, and tells me he’ll call me tomorrow.
I recover enough to move out to the waiting room, and feel ok to drive home by the time DM texts that she’s done and will meet me at the car.
So the next day Cardiologist #1 calls. “So…I know that I said that you shouldn’t pay for the test, but…I think you’re going to want to pay so the results are in your medical record.”
Fainting on a TTT does not automatically mean you have POTS or dysautonomia. That specific test with the nitro is designed to try to force a faint, and it happens even to some healthy people. The more critical part is the readings that surround the faint.
The criteria for POTS are actually pretty specific:
So, I actually clearly did NOT meet the criteria for POTS.
But I didn’t just faint either.
My heart stopped for 12 seconds.
I mean, at least it restarted on its own? 
So I’ve certainly gotten all the doctors’ attention at that point. And the consensus is there is a decent possibility the same thing happened during my September fainting episode. And at least there is clearly a physiological issue. (Takes some pretty heavy lifting to call this psychosomatic.)
Next TTT is scheduled with Cardiologist #2 for July, and officially…
“syncopal episode with asystole for 12 seconds, probable diagnosis of POTS”
He’s actually not certain at all about POTS, but figured that will get me to the correct specialist in case of an emergency. Because if I faint again, we’re to call 911 and have the responders assess me. He’d already done a complete heart work up on me and knows there is no structural issue, so presumably it’s something neurological. Hopefully Cardiologist #2 has better answers after the July TTT.
Stay super hydrated. Be careful in the heat. Walking is fine, but long periods of standing still are to be avoided, especially after a large meal. Etc.
Guess I’m lucky we don’t have a Disney trip planned anytime soon. Guess I’m lucky this didn’t happen on the previous couple of Disney trips since my headache started.