What Causes Dizziness And Difficulty In Focusing?

I have been feeling strange last few months with kind of blurred vision and dizzy spells. I went to opticians and got prescription glasses. I now cannot do without them even though they were only supposed to be for work. If i take them off i feel very weird. I now am finding that even with the glasses on i am still experiencing dizzy spells, difficulty focusing and detatched from reality. Could this be a serious problem. Im getting worried