Headaches are not bad, nor is occasional blurred vision - this is your pituitary gland growing as it tells the body to get ready to lactate (produce milk). If you had a brain scan it would show that it has grown quite a bit, but because your head doesn't grow with it then it starts pressing on various bits of the brain and the optic chiasm, so your vision may get a bit worse. The headaches will go away once the brain is used to what's going on and your gland will shrink back to "normal" once your baby is weaned.
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