Oh my word....you have so many issues going on here, dmax.....you want to get a house on your own...what about your baby daughter?...and why dont you want help from organisations like the Samaritans if you feel suicidal as a result.
Try and get a grip and get some help.....either from your doctors or the samaritans or similar organisation as they DO help.....
I would make an appoitment with your GP quickly and discuss all you've said with them...they should hopefully be able to advise you what to do and how to go about it....and get some help for your wife's temper swings as it wont cure itself if you dont.
.......
..i've posted some links and good luck.
http://www.samaritans.org/
http://www.nhsdirect.nhs.uk/