It does not answer your question about evacuees, but there are suicide statistics about Fukushima prefecture in general:
2011 suicide statistics per prefecture and per month.
page 8: 2010 monthly statistics per prefecture and per month.
I calculated the number of suicides in Fukushima prefecture from April to October and found 323 in 2011 versus 314 in 2010 (increase of 9 = +2.9%).
The number of suicides in Japan from April to October was 19269 in 2011 versus 18515 in 2010 (increase of 754 = +4%)