I think it would be helpful if you did clarify a few things in your post.
Do you almost always have SVT, or does the SVT almost always cause chest pain?
I'm not sure what you mean by "irregular blood flow". Is this a diagnose, or just a sensation? As far as I know, blood flow can't be irregular.
In general, chest pain is not very uncommon with SVT but how severe it is depends on lots of factors. Age, cardiovascular health, risk factors, etc. If you are experiencing symptoms of angina (blocked arteries in the heart) during an SVT event, you should consider getting the SVT treated or kept under control.
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