dizzy and eyes cant focus

Hi, i have been dizzy for about 5months now it is constant and have been back and foward to see the doctor and they still dont know what it is, they gave me a brain scan to rule anything bad out which came back clear, the dizzynes feels like spinning in the middle of my head and now my eyes cant focus properly, they feel like they are crossing. the room doesnt spin, it just feels lie my head is spinning, i cant blow up a balloon or blow a whisle as it makes me too light headed . it also sometimes feels i have pressure in my head. i do suffer from anxiety but before when i have felt dizzy from worrying it was different from this, i will loose my job if im not better and desperatly wanting to now what it is and want to get bette and have a normal life again! if anyone could help or have had the same experiences, please help! thank you.