I have a similar diagnosis. At 49 yo I was diagnosed with ET. I am 69 now. So I have had it for 20 years. In the past few years I was found to be triple negative in gene mutations. I have been on hydroxuria for the past 10 years. The dose varies but mostly 1000-1500 mg per day. Platelets hover around 600,000 to 800,000. The docs seems comfortable with this. I take an aspirin 81 mg daily. My advice is keep moving, stay well hydrated, eat healthy, limit alcohol and see an expert in this rare condition. I occasionally go the Mayo in Arizona to see Jeanne Palmer MD. I get my blood drawn once a month and see a local oncologist every 6 months. Good Luck. I will send you an excellent resource.