I guess, your create control file didn't go succesfully.

(check whether ur original conrol fle is overwritten)

Shutdown the DB with abort option, if you cannot shutdown it with "immedite".

startup the DB; --needed only if u use "shutdown ABORT"

Shutdown the DB in Normal/Immediate mode; -- needed only if the last shutdown was not normal/immediate

Move/rename the old Control file (OS command) --just in case needed

Startup nomount ;

issue the create controlfile ;

Alter database mount ;

alter database open ;