I have had Essential Thrombocythosis for 20 years (since I was 25). I am currently on a combination of Hydrea, Agrylin and asprin. My life is controlled by extreme exhaustion and crippling headaches. My haemotologist is talking about a bone marrow transplant as an option. There is not much literature for ET sufferers and I feel quite lost and alone here. Does anyone have any information about bone marrow as a treatment option for ET or any other valuable information about the medication that I take. I've been on Hydrea for at least 15 years and agrylin for about 5 yrs.