Sefer Siach Sarfei Kodesh (Erech Parnassah, Ois 15) relates that a chasid once came to Rav Bunim of Peshischa zy”a and complained that he was very poor. The Rebbe asked him, “Are you healthy?”
The man said that he was. Rav Bunim then asked, “Do you have a good appetite?”
Again, the man answered yes,
Rav Bunim then said, “So why are you complaining? You have a lot of money. The rich woman, Temer’l, the wife the rich Berke of Warsaw, spent 600 rubles to travel to an expert doctor because she had no appetite. That means that you have something worth 600 rubles.”