If you were syncing Photos with iCloud, have you gone to Settings/Your Name, signed in with the same Apple ID, and then gone to iCloud to turn Photos syncing on? The iCloud sync is very very slow. The photos sync is extremely slow. It could take several days or more for the photos to sync.
If you weren't syncing photos with iCloud, do you have a backup you can restore from? Restoring from a backup erases all data currently on your device. Any data newer then when the backup was made will be erased. A restore is an all or nothing restore. You can't access a backup to see the contents and only restore certain files.
Backup - Restore your device from an iCloud or iTunes backup. *
ASC YouTube for how to restore an iPhone, iPad, or iPod touch from an iCloud backup
ASC YouTube for how to restore your iPhone or iPad from a backup on your Mac
For the apps, have you gone to the App Store and downloaded the apps again?