I just read in the book The Happiness Advantage about a clinical experiment where two groups were to write their daily experiences in a journal. Before the experiment began both groups underwent specialized tests to determine their overall level of happiness with their lives.
For the experiment, one group was to write about, in a neutral prose, just about whatever happened during their day. The other group was to write only about positive experiences that occurred through out their day.
At the conclusion of the experiment it was found that the group who wrote only positive experiences increased their overall satisfaction with live tremendously and their outlook lasted long after the end of the experiment. The reason is simple, the brain began to give more emphasis to positive experiences which decreased the severity of negative experiences. This rewiring of the brain is simple to perform with absolutely fantastic results.
As for me, I just read this today and I am staring a journal of positivity only asap.
So, yeah, write away! Keep it positive. If you need to get something off you chest try another route. Something to think about.
"Never take life too seriously. Nobody gets out alive anyway."