You can never look at one neurotransmitter in isolation, nor can you look at a single portion of the brain in isolation, and determine how it will affect your emotional makeup. It's a lot like mixing colors - you can create an enormous palette of colors by mixing only three "primary" colors, and create a truly astounding variety of pictures by placing those colors into pixels in a panel 1024 pixels wide and 880 pixels tall, and that is only a small approximation of the colors and pictures that your brain can process and understand. Combining even dopamine, norepinephrine, and serotonin in the appropriate amounts in the appropriate locations of your brain will enable you to experience and enormous variety of emotions.
Of course, if your variety of emotions is too red, then you can adjust your dopamine levels a little and try to get them back to the picture you expect to be looking at...