|When a hard drive starts to make unusual noises that is an almost sure sign that failure is imminent and you should back up your data as soon as possible. At this point it appears that window of opportunity has now closed. Many drives die without any warning at all.|
At this point I suspect that only commercial data recovery can recover your data. Cost would likely be $1000+ (US), depending on make and model of the drive and the exact problem.
Since you have told us nothing about the drive it is impossible to even guess what happened. Many drives fail for reasons that are impossible to determine. Drives fail. That is why you should always have a current backup.