Medical term for fear of not being outdoors enough
Solution 1:
If it's an antiquated medical term, it may be related to what the opening line of 'Moby Dick' describes, having to do with 'spleen.'
"Call me Ishmael. Some years ago—never mind how long precisely—having little or no money in my purse, and nothing particular to interest me on shore, I thought I would sail about a little and see the watery part of the world. It is a way I have of driving off the spleen and regulating the circulation." - Moby Dick, Herman Melville
Hope this helps!