Actually, now that I have the numbers in front of me, I think you may be at 26/32 (unless I am way off again, been known to occur).
You started at 32 and took 12 from the Hobgoblin which put you at 20. You used your interrupt so you did not take damage from the floor runes. The swarm did still get to attack but the damage was reduced because of Soffa's mark. So you took another 12 (of the 18 they had) which would put you at 8. Then the 18 of healing from Atanos (plus your Draconic Heritage) puts you at 26.
Looks like I also missed the Swarm Aura attack at the beginning of Dunor's turn but I wont slow the game down any more to roll it. Anyone starting their turn within a square of one of the swarms will end up taking an aura attack from them.