Page edits I did last week, saved and proofed just disappeared

This is extremely frustrating and I would love some help ASAP. I was just doing last minute checks on this site before launching it and found that on the Company page it had reverted to an older version. A whole pile of changes that I made, saved and view are gone. I can’t figure out this themes versioning system as it is different from wordpress default I think. Could someone help me out please. I would so appreciate it.