You'll have to look in Update history to determine which update completed on 8 Oct. The Feature update should be paused so it suggests a Cumulative update, unless you were unlucky and the Feature update was already downloaded and waiting to install. Look in Settings > Update and security and select View update history. You can also type winver into Search and select the top result, that will tell you the version and build.
A system restore will not recover user documents, it is to restore windows system files and settings.
After you have checked then post back.