Thanks for getting back to me @ElChapo. I had drunk some water but did the blood test first thing in the morning around 07:00 so def could of been more hydrated. I’m honestly not sure it’s a headache actually due to haematocrit, I’m prone to sinus issues. Hoping it’s not anyway. Ive also dropped down to a trt dose now, not sure if that will help at all.One blood donation, which is half liter, will usually drop hematocrit by 2-3%, or in your case 0.02-0.03. It will likely take 2 more donations to drop your hematocrit into a more reasonable range where symptoms will go away as i stated before, because your hematocrit was extremely high.
There is a special kind of donation called "double red" or "packed red blood cells" where they take twice the amount of blood cells, but they pump the fluid portion back into you. This would drop you back into range immediately, but it can drain your iron stores very fast.
Were you well hydrated when you drew blood in the labs you showed me with the high hematocrit? Being dehydrated will make the hematocrit appear higher than it actually is.