Do you ever have random waves of negative feelings or emotions? What do you think causes them? How do you deal with them?

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Currently experiencing a brief bout of negative, sad, and maybe even depressive thoughts & feelings. I’m not sure where this came from, but I suspect it is from a combination of not eating enough today and running nearly 6 miles in the sun. I feel somewhat sluggish, but also I feel less optimistic. I’m usually hopeful & optimistic everyday, nearly all times of the day.
Do you ever have random waves of negative feelings or emotions? What do you think causes them? How do you deal with them?
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