Well, Spain doesn't pay too well to start with and yes, there are problems with getting employed. Many spanish medical residents usually end up specializing in other countries (Belgium, Germany, Portugal) due to the stiff competition for training/residency placements. The best thing would be to personally talk to a few Spanish medical students and ask 'em what the job market's like. I do believe the medical system is very tough there and many don't finish within 6 years (just like the Italian medical schools.)
If you like the country so much, you could perhaps go to med school in some other European country and then do an exchange/ERASMUS year in Spain (if you're fluent in Spanish!) or you can even do most of your clinicals there.