I too have had many of these exact symptoms. Dr. Said erythrocytosis. I'm to have blood test checked right now every 3 weeks. They took one unit of blood and it helped with the itching about 75%. I am currently feeling the itching coming back. The dr. Is have me do a ct scan on upper stomache and lumbar of my back because of pain I've experienced for many years. What does erythrocytosis mean ? Is this something that will be curable? Does it turn into something worse? I just want more understanding.