Hi...my name is Claire and I have jak2 mutant. Diagnosed in November 1918 and was given the medication hydroxyurea 500mg five days a week. The weakness and fatigue has greatly improved but still remain. Some days I have to mostly stay in bed because my body is so weak. For the most part I think I am doing well but I wonder if anyone else out there still has chronic weakness. Also does anyone have an occasional itch with blisters on scalp. Thank you for any information You may have