I am awfully late to this but it's been such an interesting discussion. I hope the varied responses have helped to clarify things for you, Helena -- you have so many gifts and talents, as Angie pointed out. I'm sure you will find the path. It's just especially difficult in this time. Or maybe not. Your daughter's school situation seems like a big sign from the universe that you are currently most needed precisely where you most want to be.
Like Janet, the activities and pursuits that absorb me most deeply have been consistent throughout my life. Reading, writing (as soon as I could), making art (not that I do that any more), walking, biking, skating, cooking. On a more cerebral level, I've always been interested in and deeply curious about human psychology, some aspects of science (esp. biology), urban ecologies and urban planning, architecture, politics, ethics, questions of social justice.
In fact, if I have a passion, it is probably for learning. That's what the skills finder test tells me, anyway. I love love love love love to learn.
That said, I tend to agree with Rachylou that "passion" is overrated, and I almost feel the word has become a kind of cudgel. I mean, how many people, realistically, get to "follow their passion" to a meaningful and moneymaking career? Or even one of the above? The idea that we should do so, or that if we chase our passion, our lives will magically become perfect, is one of those pernicious neo-capitalist myths whose effect is to make us feel bad about ourselves and "less than" all the apparently perfect SM influencers.
Anyway. I'm a writer but I do not make money from it. My most recent royalty statement was, I kid you not, $10.57. I do make a living, sort of, from the cognate fields of part-time teaching of writing and contract editing, manuscript consultations, etc. And scholarship.
And even though I would not say I am passionate about it, that work, too, is meaningful to me. As Cardiff Girl's said of herself, I've learned through experience that my work must feel meaningful to me or I won't be happy. I need to feel I'm contributing to others . In fact, I left my better paying full time job at the fitness company partly for that reason; the work didn't align closely enough with my values.
Anyway, this is all about me, not you, but what I think I'm saying is: Try not to beat yourself up if you don't feel you have a passion. You are doing meaningful work right now with your kids. In a year or two, things may change. In the meantime, you might study something that interests you or volunteer for an organization that aligns with your values. And go from there.
I also really like Rachy's point that it's important to know if you can stand the real conditions of a line of work. Interests are one thing -- the job itself might be different. But sometimes we can't guess that in advance -- we only find out by doing.