Changing careers at 17 years into a job, is it realistic?

My layoff made me rethink whether to stay in my field. I would rather hear the honest version than the polite one. I have good customer skills and I am comfortable with spreadsheets. Has anyone made a similar move?

Thanks for writing this out. I went through something close to it 6 months ago, and it settled down once I kept a simple log of every call and form.