Once you get past the first bit where everyone has a shot at you, you should have an easier time.
Have you lowered the difficulty setting in the game options, if you are not already playing on easy?
I don't know how badly you could mess up your stats. Finishing the game on level 36 I had 39 unused stat points (see here for details:
Finished Divinity II? Tell us with which stats).
Do you have any spare skill points you can use to adjust your strategy? Even one point in Life Leech should help, if you don't have it already. Same with Evade and the healing spell (though you may have lots of healing potions).
The
walkthrough has a skill list with descriptions and comments on each of the skills.
There is a skill book at the stairs between the entrance corridor and the main room.
What class is your creature? I found mage better than ranger, which is much better than warrior. Anything would help as a distraction, though (use a ghost or demon summon if available).