I nearly threw my PC out the window. Then again, I nearly did the same with Morrowind when I decided to attempt to clear the first cave at level 1, and The Witcher when I decided to take on the bloody dog with far too little experience, and... well, probably most games I've played have had That Moment.
D:OS is a bit more demanding when it comes to really pushing you to the limit of what you can reasonably be expected to do, though. I feel your frustration, even as someone who's definitely more at the casual/explorer end of the difficulty spectrum!