I don't know what a G.E.D. is, perhaps you could explain a bit further?
There are many people in med school today who worked
jobs, and then returned to complete med school
pre-requisites. Depending on what a G.E.D. is, you
might be able to get by with just doing the medical
school pre-requisites, writing the MCAT, and then
applying. This would take you 2-3 years.
If you wanted to do the Bio degree, it would take you four years.
I think you've already answered the most important question: Is this important to me? From here on in, you'll have to plan, and really take into account what you'll be giving up. Education is an expensive purchase. Not only does it cost money, but it also eats up time where you could be making money at a job. You have to be realistic in what you will be giving up, in regards to financial security, school work, the trauma and travel of the application process, and the possibility of moving to a new city to study. Also consider carefully the amount of time you will have with your family, and the sacrifices that would have to be made.
The above is not an attempt to scare you off, rather it was my realistic appraisal of my situation, that I made before I applied. I think it's going to be worth it. If this is a dream of yours, you have my complete support.
Also, an important resource you may wish to check out is: www.mommd.com It was set up as a meeting place for mothers either in premed, or in med school.