So, if you e-mail me such questions, chances are that I won't respond, and the weightier the decision, the less likely I am to dole out advice. If I do respond, here's what you'll likely get:
Still want advice? Okay, here it is: Yes, you may indeed be crazy to consider dumping your secure (one assumes) job and going for a career in academia because it's a long (5-10 years), rough road, far from everybody makes it through, and even those who do face dim employment prospects, often with tens of thousands of dollars of student loans. Yes, it's a good thing -- a great thing, even -- to have a fulfilling career. But as previous posts here and elsewhere have noted, going to grad school is far from guaranteed to result in a career of any kind. There is no magic formula of X motivation + Y level of work = Z outcome. You might end up with the result you want, which would be great (career satisfaction! regular paychecks!), and we'd all do a happy dance. Or you might end up unemployed and in debt up to your eyeballs. Do you love your chosen field so much that simply the process of getting the education would be satisfaction enough, even if there was no job at all on the other end of it, and you had to restart your old career, or begin a new one, in your mid- to late thirties?
Most importantly: if, as your letter strongly implies, you have a family depending on you and your current job for part or all of their financial support, then they're the ones you need to be talking to, because they will be the ones making the sacrifices. And that, my friend, is the best advice I can give you.
That, and: Plastics.