Before I was diagnosed with ET JAK2 + nearly two months ago, I was occasionally having visual disturbances, almost passing out, with cold sweats and sometimes being sick. These attacks happened with no warnings. Usually after a few minutes the vision returned and after a short period of rest I felt better. The doctor thought they were Vasovagus attacks caused by variations in blood pressure, which has been a little higher than normal for some time. Like many of you sometimes I feel as if I am on a rocking boat. I am taking 8 tablets of 500mg Hydro per week and my platelet count appears to be coming down. As the attacks are becoming more frequent, my question is does anyone else have these attacks, are they a normal symptom or related to the medication?