you for reaching out on the community and telling us about your issue. I do apologize for the issue you're having. I would recommend trying to fix the issue by running a validate. You can do so by going to the top right and selecting File > File operations > Validate and repair > Validate file > Ok. Once you've done this see if you're able to get you're able to get it back up.
It looks like you're new here. If you want to get involved, click one of these buttons!