Yeah... Just right quick to let you know, the trog boss managed to hit you twice. Now here's the thing:

His first attack is a 23 to hit your Staff and sundering it with 13 damage. Looking up in the DMG, your staff is a "small" but resilient object wooden... So it has 10 HP. That will sunder your staff.

His second attack 24, this time to hit you, also for 13 damage. This will put you down to about 2 HP. I think you still have a lucky point left, if you want to use it to reroll.