Health compared to damage and level

Hello there! I am a level 42 Fire Elementalist (Witch). I have but 1.6k health ish compared to just about that number in DPS. I have a ridiculously powerful fireball. You might call me stupid for only desiring to play in the Hardcore league and on that note I fear my health is nowhere near enough to fully fight in Act 4. I just entered Kaom's dream and essentially almost got effed in the butt by some things called Saplings. About that time I finally looked at my life total a bit closer. Level 42 with but 1.6k health. How much should someone like me truly have?

https://www.pathofexile.com/fullscreen-passive-skill-tree/AAAABAMCAAQHBLMI9BBYES0TNRekGjgfAiL0Jy8qjSycMPgyNDLRNtg6WDrYRKtFR0WdSRtTNVNSVa5VxmpDbAttGXyDghCCm4Pbh2WPppBVkyea4KIArJivt7zqwGbfit-w5FXr7uxV8B_xbA==?accountName=Bloodrian&characterName=Hirja