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Hi,
Don't worry i will help you.
1. Go to settings
2. Then Power Management
3. Thenunder Power Management Select Ultra STSMINA mode then deactive.
After deactivate Ultra STSMINA mode you will get back all the app.
I also had this issue once. I resetted my device and the issue was solved
That's a good idea
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
This has been covered here:
/t5/Xperia-Z2/UltraStamina-wipes-list-of-turned-off-apps/td-p/982002/page/7