Occasionally, I've experienced something similar where I feel a wave of sadness for no reason-- its potentially hormonal. This is an anecdotal answer, but what tends to work is for me to recognize this feeling, don't try to attach a reason to it arbitrarily, and let it pass. It takes as little as a few minutes or as long as a few hours. The more I think about it, the longer the feeling stays. A few other things that have worked for me:

-going for a walk/going outside
-some yoga
-sprints/hill sprints - i get a little euphoria kick
-drinking a hot beverage (i've probably tried some sort of voodoo
tea called "happy" or something, and this could have an effect real or
imagined/placebo)
-a little caffeine (i'm very sensitive to it, so a little seems to be a mood
lifter, but probs not for
everyone)

-my goofy boyfriend also tries to make me laugh, which seems
to help ;-)

As someone who has practiced mindfulness for many years, I have to say that sometimes there are organic reasons for these sorts of episodes.

Right now, I suspect adrenal fatigue for myself and have started prioritizing sleep, taking Natural Calm magnesium before bed, reducing caffeine intake, and napping in the afternoon when I feel like I'm going to die if I don't. It's definitely helping.

It could also be other hormones at play.

So the mindfulness stuff is a great suggestion, but it isn't always helpful. It's like telling fat people to eat less and exercise.

Probably hypoglycemia, Joy. Blood sugar issues are usually complex, but potassium plays a big role. I hate to bring Ray Peat into this, but his diet regulates my blood sugar like no diet has ever done before. You should see the constant smile on my face, my mother said I constantly am happy.

The common misconception is that sugar causes insulin resistance.

What made the biggest difference for me, is never eating protein (especially eggs and chocolate) without sugar (from well-ripened fruit). That has also removed my atopic dermatitis-attacks.

High doses of vitamin D3 also help tremendously with all this.

Your mind is running away with you.

This is a job for Mindfulness practice. I highly recommend Mindfulness in Plain English by Bhante Gunaratana as a good starter manual.

I sorta had the same issue, and ditching wheat was probably A #1 for me. I'd say my moods have definitely evened out over the past year since going paleo.

+1. I had the exact same experience, although once I started eating paleo my moods have evened out significantly, and I don't have the crazy stressful frustration/anxiety attacks nearly as often. Are you getting enough sleep and eating enough? Sleep deprivation (or being kept up late at night) or not eating enough protein are both major triggers for my mood to fall apart. Too much stress does it too. Writing or playing with my dog have both always been strategies for releasing the tension. Going outside and engaging in something physical or using touch (sitting in the grass, throwing a ball for my dog, etc) also helps a ton...moving your focus from internal (mind, frustration, etc), to outside (what you are doing or touching or hearing or seeing) basically.

My girlfriend has this issue as well. It is 99% due to Roxicodone use and 1% I can be thoughtless at times. I can predict her moods based on her Xanex/Roxi schedule. This is prescribed drug use. She was a heroin addict in her late teens. They weened her off heroin using oxycodone and are now tapering her off opiate addiction using Xanex/Roxi.

To be clear, I am not accusing you of being a drug addict. My point is too illustrate moods can change for a number of reasons...low blood sugar being one. I know my coworkers can always tell when the lunch hour is by my mood. I get more abrupt and my patience shorter when I have not eaten in a few hours. Does your frustration happen around the same time everyday/every week?