My guess would be he used his debuff on you that took away your Physical Resistance and you ate the heavy Physical Damage from the meteors. It doesn’t help that you only have 1k Armor with 70% Armor Absorption too.
That’s just my guess honestly. There’s a guide for HC and what you need to focus on to survive somewhere on the forums. I would find it but I’m on my phone right now.
Edit: here it is: [1.0.0.9] ForgottenKane's Hardcore Survival Guide