Is there a diagnostic name for this in the field of psychology?

Factual Questions
1

A depression caused by, I think, removal from a more socially active environment to one much less so.

I suppose it could be short term or the beginning of something a bit longer lasting, depending on the individual involved.

To better try and describe what I mean, I just returned Friday night from a week spent on vacation with a large (11) group of friends, wherein we always had company whenever we wanted. Saturday morning I was bummed out and I recognized that as being very similar to the somewhat depressed feeling I’ve experienced when being released from a hospital after a few weeks or a month to go home, still on bedrest. No people around, and the routine is changed.

BTW, I’ve bounced back pretty quickly, but it sure was noticeable.

I just swapped email with one of my compadres from the vacation trip, and she and her husband were both joking about needing some antidepressants for the near future, so I doubt I’m alone in experiencing this.

2

I think you’d file that under adjustment difficulties, although it hardly sounds clinical.

3

I am with ultrafilter on this one, it is not clinical at all. Clinical depression is a serious disease that you would recognize instantly in its more serious forms if you walked through a psychiatric ward even one time. Antidepressants take weeks to work and their effects are unpredictable if you don’t have depression. They certainly are not “happy pills”. I think your description of being “bummed out” is the appropriate medical term. It is well within the normal range of moods.

4

Sounds to me like you’re describing the phenomenon of loneliness.

5

Gin and tonics are the normally prescribed cure.