Just to follow up, I've update sentinel. It can now fix the wallet and masternode for you (option 2 while starting, run if you still get WATCHDOG_EXPIRED).
https://github.com/ZonnCash/sentinel/releases/tag/v1.1.0.1I have also fixed up the path for "sentinel.conf", some messages ago it was reported that it didn't work (and in fact, it didn't). Now it works just fine!