Dealing with people who tarnish your image

Q: How to deal with people who lie about you, tarnish your image, hurt you and deprived you of your basic rights. They constantly taunt you and pick faults in you? How to stay firm in faith when you see a liar and deceptive people to be successful in life while truthful and honest ones suffer? 

Is continuously praising oneself and thinking low of others permissible in Islam?

Trading gold on the forex market

Q: I have recently heard of a new venture many of our Muslims are going into, it is the trading of gold on the forex market. I wanted to find out if it is permissible and if so then how, as no physical exchange of ownership takes place, and also if you own an item although it can depreciate in value it won't cease to exist as is what happens on this gold market.