What do I say to prospective employers?

[Ciare]

I have been in my job for not even a year and have already had three months off due to anxiety (work 2 days a week) and now I can feel my anxiety returning so have not gone into work for the past week, I am pretty sure that I will lose my job as even though my managers have been great and have worked with my needs, there is only so much they can do, and the absence policy is set in stone. I must admit I am also not enjoying my job which I think contributes to the anxiety.

I was wondering though how to address the issue of why I left my last job (as to be honest I think I'm going to lose this job) with new employers? I don't really want to say anxiety as I feel they may look as this as something negative, and not even want to employ me.

Can an employer put the reason why you lost your job on a reference?

Thanks