Cydia apps gone after install and respring

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.

I had this problem recently. Uninstalling 'libhide' from cydia did the trick (they were all there, just the hiding function had got a little excited...)

I found a way to get my apps back.

1. I downloaded ifile.ipa and Cydia Impactor
2. I opened the Cydia Impactor and then dragged & dropped the ifile.ipa onto it, waited for it to be installed on my phone
3. Once it finished I opened iFile on my phone.
4. In iFile I went to var/mobile/library/caches/com.saurik.cydia and then I deleted that folder (com.saurik.cydia)
5. I exited iFile and all the missing apps appeared back on my home screen.

I hope this helps!