Don't panic. We will try our best to resolve this for you. But first, ask yourself these questions
Do you have any hide fields, filter or sort enabled on your table?
It is very much possible that your data is still in your stack, but just temporarily hidden if you enabled any hide fields, filter or sort controls.
Please open the controls - Hide Fields, Filter or Sort to see if any of them are enabled. Disable it to see your data back again.
Did someone delete the data?
When you are working with your other team members in your stack who have Owner or Creator permissions, it is possible that one of them might have deleted the data.
Please contact your fellow team members and ask them if they might have deleted the data.