How do I handle a long gap on my résumé? after 13 years as a production planner

I have been out of work for 13 months and worry about the gap. Thank you in advance. I have done some volunteering and a course during that time. Did anyone get past it?

Thanks for writing this out. I went through something close to it 13 months ago, and it settled down once I kept a simple log of every call and form.