Last year I wrote a thread about how 25 years in psych has affected me. Here is a bit from that: "I have been challenged and blessed in more ways than I can count throughout these years. Have even experienced, at various times, what many patients do. Major depression, anxiety, chronic insomnia, even assault, PTSD and chronic pain. Certainly brought about growth in empathy and humility, which helped me to be a better nurse."
Those same experiences (including the assault and resulting chronic pain and PTSD) could have happened to me no matter what field of nursing I was in.
I don't believe it has affected my home life any more than any other type of nursing. I also do not think it has "brought out the craziness" in me. The mental issues I dealt with would have happened to me no matter where I worked. The hours I worked (night shift) was the main culprit, not the environment.
I love psychiatric nursing and yes it has affected me, just like many years in any field would. Best of luck no matter what you decide.