It sounds, unfortunately, like you're going to have to rely on your local ER for relief. You should not let SVT over 100 go on for longer than 24 hours before seeking help, and at the ER is where they specialize in more immediate and personal care. A decent cardiologist will tell you what you have, hopefully why, maybe how to control it going forward, and I would hope, as should you, that you get referred to an electrophysiologist for an assessment for mechanical intervention. What that might be is only a guess....first things first.