I would not bother to test with another IgG test. If it is a false positive, it will usually stay positive on the IgG test. You definitely need a western blot. This is especially true since your recent partners have tested negative. It is, of course, possible that you contracted herpes before these partners and did not transmit the virus. So truly, all options are on the table.
You can get the western blot in one of two ways: you can contact the University of Washington for a test kit to be sent to you for your provider to draw blood and send it back. The other way is to become a phone patient of our clinic and we can order the test for you to be drawn at a lab near you. Either way, you REALLY need it.