Cydia apps gone after install and respring I installed Overboard from Cydia and after respring all my Cydia apps are gone!

There is no Cydia section in Settings. I have reinstalled Cydia Substrate and PreferenceLoader, but nothing happened.
Go into Safe Mode using a tweak or by rebooting whilst holding volume up. Once booted, open Cydia and uninstall Overboard, then respring. If the icons still don't show, ssh into your device as mobile and run uicache then respring.