You searched for: “cathisophobias
kathisophobia, cathisophobia (s) (noun); kathisophobias, cathisophobias (pl)
1. An excessive or abnormal fear of sitting down: When someone has kathisophobia or cathisophobia, he or she may actually have anxieties about being trapped or is unable to sit still.

A kathisophobia may become the source of fear because it can be painful or uncomfortable in some people; especially, the elderly who may be forced to sit for longer times than younger persons, simply because they are not as ambulatory or capable of walking.

2. Etymology: from Greek kathizein, "to sit down" + phobia, "strong" or "irrational fear".