i can never seem to find the answer within myself until my environment has changed or someone that i care about says something clever that uplifts my spirits. my emotions tend to control me instead of the other way around. this is something i have been working on quite a lot lately. it gets a little frustrating at times knowing that i do not react well in what i would consider a volatile situation.
My emotions don't have limits (apart from the emotion's nature itself). As for the environment blocking me, I break through it although that is not necessary as the environment is built up on my emotions, so it always acts according to them. But most of the time, the 'environment' is this case is the mind, not the physical world, in case someone missed this point. It is more like letting go of fear.
To recall an emotion and reproduce it you simply have to use your introverted intuition, that's why INFJs are so emotional after all.
I can switch between happiness... sadness... and anger very easily.
Just sitting here. One of the upsides of dealing with intense emotional reactions throughout my life is taht I have very good control of them. It's kind of like inception... first you need to realize that the emotions aren't real.
Don't call me a sociopath, but I activate genuine sadness any time that I request turning in a paper late or re-doing a test to my professor. I call it the "puppy eyes" xD