I've had 4 ekgs, 2 stress, 6 holters, mri, cat 4 echos. are these enough test see if structrallu normal? what could be causing multifocal pvcs?

Too many: I hope that all these tests were not ordered by the same physician, at least not within a short time. The repeated tests you list, if all normal, are more than enough to definitively exclude structural heart disease. "multifocal pvcs", in-and-of-themselves, are not life - threatening. They need treatment only if they cause troubling symptoms, or if there is underlying heart disease. See an ep doc.