What would you recommend as best beta blocker with least side effects to treat my svt? propranolol & metoprolol made me too dizzy.

Dose dependent: It's not so much the med as the dose - since the side effect of all BBs is to lower BP. If your BP becomes too low, you'll get dizzy. That said, the BB I like the best for SVT is nadolol. The usual dose is 20-80 mg once a day, but for you, I'd recommend starting at 10 mg once a day and if you tolerate it, think about increasing the dose.