I have SVT attacks about once or twice a year. They saterted when I was ~32, and I’m 37 now.
My first time, I was sitting in the bank listening to a loan officer tell me that even though my credit was good, they would only loan me $8000 to build a house, as I was building it myself. My heart rate went way up, I got very dizzy and short of breath, and I assumed it was a panic attack. I excused myself, drove home, and laid down for an hour or so until it went away.
The second time it happened, I was in my appartment, bent over to pour some dog food in the dog’s dish. I sat down for 15 minutes, and when it wouldn’t go away, my then live-in girlfriend (now wife), took me to the ER. They knew immediately what it was, and gave me adenosine, which stopped it immediately. Most people apparently report that the adenosine makes them somehow feel worse for a short period, but I don’t understand how much worse you can feel than when your pulse is over 200bpm and your chest feels like it’s going to be ripped apart. They did chest xrays that showed I had pneumonia. I had had minor chest pain for a month or so prior to this, but I thought it was a pulled muscle or something. They treqated the pneumonia and taught me how to deal with the SVT attacks:
Lay down with feet above heart
Rub carotid artery hard (one side at a time only 
)
Bear down like you’re trying to beam down a shatner
If all else fails, have someone throw cold water in your face (The wife is looking forward to this one!)
I had a few more attacks, which these methods stopped, before having one that I could not stop. My wife and I were clearing land for our house. I was working 4:00 AM to noon, then I’d grab a quick lunch and cut wood until dark. I was drinking 2 or 3 galons of gatorade a day (Note: I now know that high potassium levels are not good for someone prone to SVT). We were in the middle of nowhere, and I’m running a chainsaw when my heart kicks into overdrive. I shut the saw down and tried to stop the attack, but no dice. We had my car, but it was a stick, and my wife can’t drive stick. I decided to drive down to the neighbor’s house, about a mile away. Coming around a corner, I meet some moron on my side of the road doing about 60 as he threw his McDonald’s wrappers out the window (did I mention it’s a narrow, winding dirt road covered in potholes?) After some fancy driving manuvers on and off road, I stopped the car without hitting him or anything else. It was then I discovered that adrenaline works as well as adenosine to stop SVT attacks.
I’ve had a several more attacks, but I can almost always stop them. My last one was about 6 or 8 months ago at 4:50 on a Friday afternoon at work, and I couldn’t stop it. I called the only professor in the building, and had her try the cold water in the face thing - didn’t work, but she thought it was funny after the fact. She called an ambulance for me, and our security guy came by first and took my pulse. He thought it was weak, but counted it at ~50 bpm. The emt’s arrived and hooked me up to the machine, and it was over 220bpm. It took 2 shots of adenosine to stop it, and I got to spend my Friday evening sitting in the ER perfectly fine. Why couldn’t it have been a Monday morning?
As for how I deal with it, I don’t until I have to. I avoid caffeine anyway, because I’m an insomniac. I try to get as much sleep as possible. I’m trying to cut down on the alcohol, but not specifically for the SVT. I have occasional blips in my heartbeat, but everyone does as they get older. It’s just that you notice them more when your heart occasionally goes apeshit. If it gets too frequent, they say I can have surgery to remove the tissue that causes the short circuit. Until then, I carry a walkie-talkie and don’t get too far from my truck when I’m off alone cutting wood, etc. on my land, but that just makes good sense anyway when you’re running a chainsaw.
My only concern is that I’m going to have a heart attack and think it’s just SVT.
IANAD, and nothing in this message should be read as a recomendation. See your doctor.