I'm going to come at this from a slightly different tack. We're pretty close to the same age, but I've not been in your shoes -- I was never a SAHM (just a stepmom, and only at home with the boys during summers and every other weekend during the rest of the year).
What would you love to do to fill your time? What are your hobbies, your interests, your loves? What makes you lose track of time or forget to eat? Can you pursue them more deeply now? Is there a way to take whatever that/those activity(ies) are and create some sort of venture or project for yourself?
I ask because I hesitated for years to concentrate fully on what I really loved to do because I feared I would not make any money. My husband saw that I wasn't fully happy doing what I was doing, and nudged me into pursuing what he knew I had always wanted to do, ever since before we met -- travel and photograph. I thought it would be terribly self-indulgent and not practical, and it was at a time when the economy had tanked and every photographer I knew was quitting to go sell real estate (which, well, didn't exactly turn out to be a slam dunk either). But he convinced me that we could do without the income I'd been making, and I slowly -- yes, I move slowly -- took steps and started doing what I loved.
Along the way I've had detours -- I took time to study interior design and architecture, which sounds like a total distraction, but has ended up being hugely valuable to where I am now, because I frequently work with designers and architects to place my art in their projects. In fact, this is becoming the bread and butter of my art business. I also took a lot of time away from photography in the year following my mother's death, and again when I accepted a temporary fill-in position at a radio station. I don't regret any of these detours, and in fact, in a way, I find all of my experiences end up enhancing each other -- my worlds often collide in unexpected and wonderful ways, as I have gotten more involved in my community's active music and art scene.
So, long story about myself, sorry, but I was hoping to illustrate the point that following my heart rather than what I *should* do (take a practical job to make $$) has ended up enriching my spirit and my mind so much more. I realize it's a HUGE luxury that we could give up my income for me to pursue this dream -- we've come a long way since my husband had to pawn a guitar to take me out on a date when we first met. But it sounds like you aren't in dire need of the income right now, and you have the benefit of having some time to really have fun, explore, and dream. You seem like a creative person -- I bet there is something you've been wanting to do!
I hope this is at least a little bit helpful.
