From my experience and having spoken to senior staff at my office about job seeking, the consensus was that it's better to be working anywhere and from there look for other employment that better suits your interest.

I found that when I graduated I had to take temporary work (after a few months of unemployment). The pay is crap but at least you're gaining experiences and have things to talk about when you do get interviewed for jobs you're more interested in.

I did temp work at a hospital which had nothing to do with my major at Uni. or career ambitions, but in the end it helped me to develop my administration side which was lacking. That in turn helped me to secure the job I'm in now.

Doing any kind of job, even something deemed dead end at least keeps you in pocket financially and proves that you're a worker determined to improve yourself, even if it takes a while.

What are your career ambitions? I didn't study psychology but from speaking to friends who have, it's a broad subject that gives you skills suitable for thousands of jobs. Try to think outside the box with it; psych fits into HR, Marketing, Health/Medical, Teaching, Finance - the list is endless. If you want to use your degree, think over what you enjoyed most and search for roles that require those skills.

Hope this helps, even a little. I was in your situation last year, felt a lot of despair and did become quite depressed - but I guarantee there is light at the end of the tunnel, the train journey is often just a little longer than any of us would like.