Jack was diagnosed with persistent depressive disorder and has experienced recurrent episodes of major depressive episodes. in the intervals between the episodes, he does not seem to return to ""normal."" jack's condition is referred to as

Jack's condition is referred to as DOUBLE DEPRESSION.
Double depression is a medical condition in which the affected individual experience chronic depressive mood which is accompanied by one or two other symptoms of clinical depression which last for a minimum of at least two years. It is often a difficult condition to treat.