13-month résumé gap, advice? after 4 years as an HR coordinator

My résumé shows a gap from a layoff and some health issues. It has been weighing on me all week. I have done some volunteering and a course during that time. Did anyone get past it?

I listed the volunteering and course under the same dates and kept the explanation to a sentence in the cover letter.

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