For me it was anxiety. I suffered bad anxiety and started having panic attacks after I came down with PN. I was also told my symptoms were caused by my anxiety and there wasn't anything wrong with me.

Sometimes I also felt anger and frustration. And I would get angry that I no longer could do the things I wanted to do. Then I would force myself to be happy again by reminding myself that these emotions while perfectly natural are counter productive to my recovery and health.

I would often watch movies mostly comedies. Laughter is good medicine.