What do I say about why I left my last job? (Madison)

I have an interview next week and I am unsure how to explain why I left my last job as a marketing coordinator. I have read a lot of threads here and could not find my exact situation. I do not want to blame the company.

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.