PSVT can be caused by abnormal electrical activity in the atria called atrial fibrillation or atrial flutter, an accessory electrical conduction between the atria and the ventricles which facilitates a fast heart rhythym, or disordered conduction in the AV node. In your case, I would recommend that you wear a Holter monitor or a longer-term monitor for at least a week and note on the monitor when your symptoms are occuring. Once your rhythym can be adequately determined from this monitor, the true cause can be ascertained. You seem incapacitated by your symptoms so a reevaluation certainly seems in order. I hope this information helps.
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