>>1I tried interpreting my dreams a long while back. I suggest you read Freud's article, On the analysis of dreams.
The subconscious assigns symbols in your dreams that represent your reality. Even your actions in your dreams are symbolic. You maybe angry in your dreams but that does not mean you are truly anger in real life.
Freud suggests that good people tend to have more nightmares. This is because they repress negative emotions. Our subconscious will act out negative emotions in our dreams as a way of balancing the conscious's repression.
Example: A store owner is losing money because he refuses to raise the cost of his food knowing that the food really isn't worth more. In life he is moral person who does not want greed to take over his life. In his dreams he sees himself in porshe and a suit and stuffing hotdogs down the throats of his customers.
In real life he secretly wishes he could raise the price and he wishes more customers will come to his store and eat his food but not at the expense of his morality.
His dream provides him a relief from reality and expresses his fantasies. This allows him to endure the pain of losing money. If he wants the dreams to go away he has to either make better food or find a way to attract more customers.