One of the best things is to exercise. Just go for walks. Lots of them. Every day. It clears the head & produces endorphins.
Next, find a way to talk w/a professional. Google "psychologist on a sliding pay scale" in your area. Even if you only go to 1 or 2 appts., it can
help & they can provide professional insight/helpful tips.
Do you belong to a church? You could try talking w/your pastor/priest etc.
Keep applying. It's a numbers game & eventually something will come of
it.
Also, look at your resume. Really look at it. Make sure it is at it's best
(professional, concise, highlighting ALL of your strengths, not too wordy,
lose extraneous stuff you don't need to include).
Look outside your normal realm for jobs. Think just outside the box.
As far as your car goes....until it's fixed or you can afford to fix it, try looking at things very close to you, look into taking the bus etc.
Make a list of 10 things you are extremely grateful for in your life right now. Keep it handy (your purse) & pull it out often.
Sell, try to get rid of things around your house right now (garage sale,
Craigslist) to make extra money.
Call your cable company to see how you can lower your bill.
Try to do one fun thing for yourself each week (taking your husband's
car)....smthg cheap....going to a nearby outside mall to walk around but
not buy anything, a park to walk around with, rent movies from the library