that's a good question. when i returned to my career i made no mention of my bipolar and depression. not cuz i felt i needed to hide it but it wasn't germane to my being hired. my dx's were also manageable at that time. sounds like u're the same. but regardless it doesn't need to be discussed.
also it's inappropriate for the interviewer to bring it up. it's why you should be considered for your business experience not your mental health.
best wishes for your upcoming employment!