What this sounds like to me is simply a manifestation of something negative in your life in a dream. For example you said that the entity was forcing your hand in an attempt to crash the car you are driving what this suggests is that you feel as if someone or something is stopping you from achieving a goal in your life also the fog you described suggests that you cant see or predict when this negative thing in your life will try to stop you from reaching your goal. The fact that your wife experienced a similar dream can be simply explained by that she feels the same way you do so perhaps its a goal you and your wife share and could be to do with your marriage. If you don't have children i would say the most likely cause of this is that you and your wife feel as if your being pressured to have children at some point which explains the fog as this represents the unknown and the attacking force would be anyone in your life encouraging you to have children. This is what i can gather from your post which makes my final conclusion somewhat inaccurate as there are many more variables to be considered that at this point only you can be the judge of.