That sounds good to me. It clearly states that it does not affect your ability to work in Japan and has passed. 'episode' implies short therm and hence also that not much treatment was needed. Of course, it's always best to call up the JET desk to get a definitive answer.

I have asthma on my record but my doctor wants to charge £30 for my physician form and she hasn't even mentioned my asthma (it doesn't affect me anymore, but I was hoping she would say so) - I called up the JET desk and they told me I don't even need a physician form at all for it, so that's £30 saved :P .