I think you need to process that dream. Once you process it, it won't be a big deal in your life and you can let it go.How do I just let go and stop caring? I
For me, in order to process something like that, I go to my journal, and write down the issue in as much detail as I can. Then I break apart the detail. For example: Let say, I'm thinking about my father and one particular incident. I will break down the words (give each one a definition) and see if I agree with that definition. Goodness, I hope this makes sense to you.
Anyway, once I see the reality of that particular dream/issue it become a past thing that goes away. You might want to try it, it can't hurt.