I'm not sure I can really help much, but I tried to find some info that maybe can help out.
Use the VA for everything you can get from them, if you're not already. They've helped my father immensely in both housing help, and health care, both mental and physical. Keep hounding them for everything you deserve. You have to stay on the asses of all these people. Don't wait for them to come to you, because they take forever...as you're sadly finding out. Here's a link to pro bono legal help for veterans. I don't know if this'll help, but it might be worth looking into.
http://www.vetsprobono.org/newsite/links.htmhttp://www.vetsprobono.org/exec.htmLink to VA services
http://www.va.gov/Take advantage of food stamps. Even if you only get a small amount, it's a big help. They saved my life until my SSI case was decided.
http://www.dss.cahwnet.gov/foodstamps/I'm not sure where in Cal you are, but look into your state's Department of Transitional Assistance. A few years back I checked myself into a hospital instead of killing myself, and they set me up with both health care and emergency aid. The emergency aid was only $303 a month, but that kept me alive for two years until the SSI went through. It may be more out there in Cal. They'll also be the ones you'll need to deal with for food stamps, most likely (that's how it was here in Mass). They can also help with fuel assistance if needed in the winter.
http://hss.co.san-bernardino.ca.us/HSS/tad/address.aspYou say you're not suicidal, but you're clearly depressed, and had at least one suicide attempt before. Don't wait for the stress and depression to build up to where a second try sounds good. And even if you don't feel that could happen, it might. Look into counselors and/or a psychiatrist (the VA can help with this, but you can also find them on your own. Many take payments on a sliding scale. I'd try the VA first though, as that should be covered). This can help in any program you need to receive help from, though it'll be a longer term thing that may not help immediately. But it's good to get the ball rolling as soon as possible. If there is an underlying problem with depression or something else Section 8 may come into play, and that's a big help.
Also, look into any state or local housing assistance programs. Some can help with rent, or finding a new place, etc.
If you're worried about eviction, make sure you know your rights as a tenant before letting a landlord boot you out.
http://www.hud.gov/local/ca/renting/tenantrights.cfmLastly, look into either receiving SSI or SSDI (this is where the psychiatrist/counselor stuff comes in handy...that's what got me the SSI). Contact your Social Security office.
http://www.californiasocialsecurity.com/I wish I could offer something more concrete and immediate. Sadly, I'm not an expert on any of this, and have just been muddling my way through all of it one step at a time. If you have any questions I'll do my best to answer them.
Best of luck to you.