Plumhoudieaphobia

The fear that one day, in your early twenties, you decide to become a plumber, and then on saturday, you go to a house to fix some pipes, only to make a tiny mistake, which then devolves into a massive problem, flooding the house and destroying the floors.

Causes of this phobia
Being a horrible plumber.

Ablutophobia increases the risk of having this phobia significantly.

Past trauma including bathrooms also increases the risk.

Symptoms
Entering bathrooms can trigger this phobia, but only if plumbing issue are present.

Symptoms when this phobia is triggered include:

Intense shaking

Hyperventilating

Anxiety, feeling of impending doom

In rare cases, loss of consciousness

And in exceptionally rare cases: heart attack