I know when I was looking at entry jobs when I had experience that I was over qualified and one person explained it to me in detail; most in my position would get bored and leave, wouldn't get along with the others in the kind of position (my education and background being different), etc.

If there are entry level jobs in your field, there are probably others more akin to your level? Have you applied to them or are you just "low balling" to "make sure" you get "a" job?

Have you looked at jobs at your school/university? They often have jobs as they are always a going concern, even some larger cities and municipalities have jobs. Check back with your old employer and its bigger, more successful competition? Keep in contact with people you know (advisers, professors, friends, neighbors) they might have ideas and have a friend of a friend that knows of a job that might work for you.

There are over 9 people working for each 1 that is unemployed, those 9 people move, quit, change jobs, die, etc. like normal, and jobs become available that aren't "new".