i know you are probably too smart for this, but don't leave where you are until you have something lined up in the field you want to be in and in a job with comparable pay and benefits or at least one that will allow you opportunities for that in a short time.
but, as one previous poster said....don't let your work be your passion. let what you do outsode of work be your passion and what you do at work be the 40-50 hours a week that helps take care of the rest of your life outside of work.
let a job just be a job, not your life. it sounds like you've got a good thing going where you are and have developed a solid reputation that will allow you plenty of room for growth. just do your time and go home. i mean make the most of the opportunities you have at work, but try to get your satisfaction in knowing that what you are doing is taking care of your family.
just my .02.
btw, i recently had to leave my business where i got to work at home as a freelance writer to find something that took care of my suddenly expanded family better than what i was able to on my own. for clvarious reasons (mainly stemming from the surprising stigma of being self employed) had to settle for a third shift job at a distribution center.
it's far from ideal or even a dream job and a drastic change for me and my family on many levels. i make the best of my situation and opportunities, though, and have a lot of potential for growth within the company and the benefits there are great. i don't get to see my family as much as i used to and i sleep a lot during the day, but i make sure to make the most of what time i have with them, which is still quite a bit. the reason i think i am so happy with the path i'm on now is that i know that i'm doing what i need to make sure that all my families needs are taken care of and i just have to go to work and then i get to leave it behind. i do my time and come home to the loves of my life. my passions. my family. work is just this thing i do for 8-9 hours a day/might then come home.
i try to keep our needs simple as well as our lives so that more isn't required of me, although i will certainly take advantage of growth opportunities there. i will say that my education (mba with a concentration in leadership) will be utilized a lot more than when i was at home securing and working on writing gigs so that makes what i am doing a lot more bearable.
sometimes a change in career is necessary, but whatever it is you decide to do, whether stay the course you are on or changing fields, again i would just encourage you to be more focused on life outside of work to be what fulfills you.
sorry for the long post.
I love your post and totally agree. I have job options where I will have to travel more than 60%. I turn these jobs down.