Shardian,
Have you considered law school? With a science/math background you could go into patent law and make loads of money. There is a major shortage of patent lawyers (you have to have physics and math classes that most law students have no interest in), so you are pretty much guaranteed a high-paying job right out of school. Firms that normally only take students that were in the top 5%-10% of their class will pretty much just hire you regardless of your performance in law school if you meet the requirements to be a patent attorney.
Obviously, I'm in law school. So I'm partial to law school. Whatever. What other grad degree can you start whether you majored in political science, music, chemistry, early childhood development, 18th century women's literature, or anything else, only takes three years from start to finish, and sets you up to make the kind of money lawyers can make?
If you have what it takes to do patent law, and it sounds like you do, and you want to completely change career fields, and it sounds like you do, but you'd still like to make some use of your engineering background (presumably you do), and you want to be guaranteed a very good living . . .
Look into it.