Imac (BOOTCAMP) ruined it

Can anyone help me please i started bootcamp i wanted to install windows 7. When the partitioning process started it was stuck near the end for a lot of time. I close d bootcamp and everything seemed normal. When i opened Disk utility i saw that it said that my fusion drive was 1000gb. On the Macintosh partition it said that i had only 18gbs free but i had only used 647gb out of the 1000gb available. Please help me. How can i solve this problem?