Fish Pond Problem

"Have a fish pond problem" = Thinking you have a huge, critically important problem to deal with.

Compared to - "Making a mountain out of a molehill" = Exaggerating and exacerbating a very minor, insignificant issue into a tremendous obstacle or crisis.

Owners of fish ponds ( like koi ponds) get very upset if something goes wrong with their koi or the environment. The world is ending if there is a fish pond problem.

John was stressed about missing the office holiday party, but his wife told him he was having a fish pond problem and it wasn't that big of a deal.
When the restaurant messed up my order, I started to get really worked up until my friend said "Relax, you're having a fish pond problem again over something minor."
Sarah tends to have a lot of fish pond problems - she'll obsess over tiny issues like being 5 minutes late as if they're catastrophic events.
The team spent two hours debating the colors for the new logo design. Their manager finally had to intervene and say they were having a fish pond problem before refocusing them.