It is over, all over because of a crash!

I spent lots of time making this game and unity crashed!
When I opened it again one scene the texture is missing. And in the other there is no meshes! This has happened one time before and I spent all my time in this.
Any help.
the assets are still there but not in the scenes. SO WHAT DO I DO!

You revert to your previous version. You would have created a previous version through your regular version control software, or by making regular backups.

If you did not make a backup you are out of luck. Learn to do backups and version control for your next project.