Why do I get very negative dreams after good things happen?

So today all my dreams (I had 6 of them) were very negative.

I'm experiencing good things in life, it's even going to get better soon. I just don't understand. Don't understand at all.

After good things I experience, I go to bed and have very negative dreams:

1) Not my house however I drive pass and a house exploded
2) I am a footballer and going down the division
3) I am getting bullied in a shopping mall
4) I look in the mirror and start crying
5) I am sitting next one who is crying
6) I am living in a small room (where in real life I'm looking to rent a 3 bedroomed house soon)-this dream doesn't make sense

Can anyone explain this please?