Help our server is down
Losing important data is a physically painful experience. I have been there.
My advice. Take a break, get a snack and soda.
Less is more.
The less that is done, the higher the probability that your data can be recovered. Get a pad of paper and start keeping notes.
Write down what has happened so far, especially any error messages.
Avoid the temptation to try a repair, safe mode, or a rebuild. Search Google on “Server Data recovery” and call 2 or 3 places on the first page. Take notes while on the phone. Did I mention, less is more?
Find a non technical person to help you create a plan.