Tsloper has a TON of great info on his site that can help you. Additionally, I've created a site aimed at the absolute beginner as well. You can find it at www.ineedtomakegames.com
The main advice I would give you based on your post is to try out some hands on game design work before you commit to more schooling. It's possible that you may not like it, OR that you can in fact find a job you love without needing an additional degree. You can do this through either solo indie development or entering the mod community and working with others.
I'd say hang on to your day job a bit longer until you can orient yourself around exactly what it is you want to do.
Good luck and keep us posted of your progress!