What is a word or expression to describe anxiety about the passing of time?

Perhaps you are feeling restless, or contemplating your mortality?

This sounds like an existential crisis, with particular reference to

a new-found grasp or appreciation of one's mortality;

However, you shouldn't really be able to experience something so traumatic on a daily basis, while still being able to function normally.

The most natural way to say this is probably to make a judgment about the unproductive use of time. You might say you regret squandering your time that day. Or, you might be unhappy you did nothing but waste time (or one of its synonyms like mess around).

Perhaps you are experiencing a mild form of chronophobia.

It's not anxiety, and it hasn't got anything to do with mortality or existentialism. It's the feeling one gets when one becomes acutely aware that time is passing. An observant sadness yet simultaneous joy and nostalgia. I think it is one of those things we have no words for, like sitting on a grassy hill and suddenly becoming completely aware of gravity holding you onto the earth's surface, and imagining that if it were to stop suddenly one would simply float outwards from the surface of the earth into the vast nothingness of space.

I guess what I'm trying to say is that the passage of time has a certain weight and physical element that you can feel when you get this "anxiety". Like the Vonnegut's Transmalfadorians who saw humans in the dimension on time. Some sort of other world and reality. Have you read the poem "Esse" by Milosz, I think it will bring up some of what you are feeling.

It sounds like this is a concept without a label. I'd like to nominate temporal angst. It sounds like the emotion you are experiencing is angst involving time.

I think this might describe what you are talking about. I started searching the internet for this because I think I feel it too. Many people talk about how they feel sad about that they haven't done (enough) with their time or whatever. But I don't feel quite that way because I'm not comparing myself to someone else. I feel that it is a intense sadness knowing that you had something that will never be able to come back and that even now in this moment time continues and will never stop so all the things you have, even in the "right now", you are losing minute by minute and will not get back and there's nothing you can do to stop it.

Even though it is not the topic of the song, I think of the line from the song "Hard times come again no more"...."Let us pause in life's pleasures..."

or when I hear the slow version of Auld Lang Syne (Dougie MacLean)

http://en.wikipedia.org/wiki/Saudade

I think this word linked above, applied to something or someplace comes pretty close. Chronophobia seems kind of close too but still seems just a little too general.

I believe that the word in nothing short of depression. I know that the medical system has many descriptions of that word, but if anxiety is a feeling of inability to control the future, depression is a feeling of a lost opportunity of controlling the past.

Understand time(reality) that has passed was created by you. If it was not desirable - you would be sad.

Start controlling your reality, which starts in your mind, and you will lose that feeling.

I have been serching for this word also and the closest i have come to is in japanese ... 'Mono no aware' - A melancholic appreciation of the transciency of exsistence.

https://en.wikipedia.org/wiki/Mono_no_aware http://www.huffingtonpost.com/tim-lomas/untranslatable-words-mono_b_9292490.html

You have the feeling that time is slipping away from you.