If you need to credential yourself, you need to be in a school of some kind. School is expensive, and the ones who can continue to afford it will be the winners once the recessionary period is over. However, those who spend some of their time consciously acquiring new skills in anticipation of better times, will be more hireable and come out ahead of those who spent time wringing their hands.
Take stock of your background -- even hobbies. What were you working on or interested in (and doing well at) when you got hired and had to put it aside because you were busy making money?
My experience as a professor over the past two decades (and in the classroom teaching for a decade before that) has shown me that the value of knowing a foreign language well, especially when combined with some other skill set, improves one's options in the job market. During the last decade, it has mattered less and less what that other skill or degree is.
Learning a foreign language is not easy. You can't pick one up like you can a cold. But if you have already studied Spanish and did reasonably well with it, Bright Hub has something important to offer you -- for free. In many of the articles, we provide links to various types of resources, many of which are also free or cost very little -- my three recently published Spanish grammar books at Amazon, for instance.
If you study the Spanish lessons (including the lesson plans -- no requirement to be a teacher to read them!), read and think about the culture articles and other tools available on this channel or through links from this channel, you'll be able to beef up your resume.
So, to begin using the contents in the All About Spanish topic area, scroll through the titles. If the title sounds like material you have covered before, open it and review it anyway. I suggest starting with the Parts of Speech articles if you have not studied language in a long time. This will help you become aware of the ways words are classified and help you understand their possible grammatical functions -- much like learning anatomy, then physiology. Next, I would suggest beginning with the articles about pronouns, demonstrative adjectives and agreement rules (subject/verb and article/noun/adjective). At that point, you are ready to begin examining verbs.
As for a textbook or readings, I personally recommend the web --for motivated and intellectually curious adults. To locate a wide variety of texts and information (including newspapers, culture, general knowledge, etc.), visit LANIC, the Latin American News and Information Center at the University of Texas-Austin.