Hello Katie!
Welcome to our forum. Hopefully you will able to get some ideas from the members here.
It sure sounds like you have been around the issue quite a bit. My only other suggestion to you is to look into an investor's visa. I think you would need to demonstrate a certain amount of money in the bank and be willing to start a business here. A visit/phone call to your local Spanish consulate ought to be able to help you out in that area.
What business could you start? Well, given your proficiency in Spanish/experience in Spain as well as your teaching background you could do quite a few things. Start (yet another) English academy, open a consultancy, open a private daycare...just a few ideas that come to mind.
I don't know if you really like teaching or if you did it to make ends meet while here, so you might have some other ideas as well.
As you find out more information, I encourage you to continue to post the information here so that it can be helpful to others in similar situations.
Take care and look forward to seeing you around here!
-Rebecca