What do I say about why I left my last job? - any advice?

I have an interview next week and I am unsure how to explain why I left my last job as a machine operator. I do not want to blame the company.

Thanks for writing this out. I went through something close to it 5 months ago, and it settled down once I kept a simple log of every call and form.

Say it plainly and move on to what you can do. Interviewers usually move on if you do.