omg lisa you are exaclty like me!
i experience that too and i still get it sometimes now... this month the week leading up to my period was shockng... i had sharps pains in my head and i felt like my head was full of water....or that i had a tumour... its terrible i know..
i did read a while ago on this website that a few girls had blurred vision... mine wasnt blurred but my eyes were so sore it hurt just to move them from left to right...
so dont worry it is another side effect... i think u have experienced the exact same symptoms as me...
at least i can help u threw it..
lots of hugs
chrissy xoxo