There was an article in, I think it was The New Yorker magazine a few years ago about a guy who did this. He talked about his mood, feeling aggressive, like wanting to fight. I don’t remember much else about the article. If I were you I would try to read some personal stories (try googling) to see what the experiences were like of those that did it. Also talk to your doctor and the doctors in the study, to see what you may expect and the negatives that you will experience.