I know it's tiring feeling these emotions, but honestly it's more tiring feeling them then trying to counter them. I try to see it as a scale, when you add negative emotions it tips the scale towards feeling bad or negative. How you counter this, is by adding positive emotions to balance the scale. Another difficult part can be conjuring positive emotions when you are immersed in a negative emotion. But you have to remember, it's as difficult as you want to be, if you thought it was easy it would be easier. It's not something you'll feel the change over night and it won't cure you. But every little bit helps, this is like a war, use everything you can to your advantage.

Another thing I learned when fighting myself and my emotions. The subconscious fights dirty, it will re-program you, it will even use it's own subliminal messages to do this. The subconscious is a crafty one, so program yourself back by using as many positive emotions you can think of to balance the scale in your favor. Let nothing slip by, anything negative counter it, search for anything positive about the experience. Trust me, there is almost always a positive side to an experience, from a negative perspective it just takes a little more work to find. Every action has an equal or greater reaction, yin and yang. Sometimes it just takes more work finding them, but they are often more rewarding when they are found.