Trish, my son went through similar for nearly 3 years, he has a science (Geology) degree. And as Flickety rightly points out, the job has to be not only in his discipline, but also his specialty. "Suffering from worklessness" affected every aspect of his life. He poured his heart out on Facebook, which worried me no end 're future employers reading his bitter outbursts as things got worse and worse.
He lived very frugally, so much so that he started looking a bit frayed around the edges. I was extremely worried about him.
He did something really good during this time: he put posters up around his neighbourhood and started what he called "The Job Club" inviting out of work people to meet every morning in a local coffee shop that offered bottomless coffee
and free wifi to job hunt on their laptops together. He soon had a little "band of brothers" and they supported each other, all ages. He said it gave him a purpose each day. I was proud of him.
Thank God, he has been back in a good job for close on a year now.