Like megatron said. You might have bunk/underdosed AI or you aren't taking enough. Estradiol increases water retention in the body. The extra fluid volume in your blood increases intravascular pressure. This pressure can cause irreversable damage to the fine capillaries in the eyes, kidneys, brain etc. High BP can lead to vision problems and kidney failure to start. Not to mentioned erectile dysfunction. An acute hypertensive crisis will should not cause any permanent damage, but chronic high BP will damage your body.