Clinical hypothetical: You are an ER physician at UMC in Lubbock, TX. A patient presents with complaints of itching and headaches. The patient also has a severe bruise on their leg that may indicate a deep vein thrombosis (DVT). Standard protocol dictates that you run blood tests. The test indicates an extremely high hematocrit in addition to the somatic symptoms. Based on the symptoms and what you've learned in this lab, what is a possible diagnosis.