Sell your stuff?
Everybody has stuff they don't need or use. Ebay is a great way to sell those items and make a little more money. Will a few of those items be enough to get you back on top of your bills? Don't like internet selling? Well get yourself off to the local car boot sale.
Realistically work out if you can take on an extra job. Maybe you are in a boring office job and have always wanted to try something different. Why not go and apply for some work at the local hospice, factory or bar? It'll get you out of the home, spending less, earning more and increasing your circle of friends and contacts too.
OK so you'd prefer your own space but the extra money that a lodger could provide can be considerable. Take time to find suitable people to share your home with. One friend I have, even ended up finding his wife when she came to stay for 2 years!