After reading on this forum the importance of working with an MPN specialist and accessing the database provided I have changed my provider. It makes a world of difference! My new doctor confirmed the polycythemia diagnosis via bone marrow biopsy but also found No JAK2 mutation. The hydroxyurea that sent me to ER is not recommended (yay!). We will be searching for a potential secondary cause of the high RBC while continuing to monitor and have phlebotomy to control the numbers.
Thank you so much for helping me find a doctor I know I can trust!