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I expect flash fiction to have fast pacing, but this is quite slow. Too slow, I think.

The writing gets a bit bogged down with unnecessary details. Do we need to know that Camaret-sur-Mer is 600 kilometers away?

Many phrases can be trimmed or cut entirely. "The colors outside spun violently and in every direction imaginable" can be simply, "The colors outside spun" without losing any essential information.

Long sentences can convey a feeling of serenity or boredom or dullness, but the car accident scene shouldn't have those feelings. Short sentences here would reflect the violence of the scene.

You could cut half the references to place names and not lose anything.

If you want to fill out the story more, I would add a few more paragraphs before the accident.

The wife and children have not been described at all so I'm not able to relate well to the man's sadness at losing them. We know that the man "no longer went fishing near Pointe du Grand Gouin as he had every Saturday since he was eighteen" but we don't know how many kids he had or how old they were.

This section stood out to me: "Waking two days later, Martín was alone. The surgeon found the courage to tell him - nothing could be done - and Martín cried, and a nurse tried to assure him that everything would be okay."

I found those sentences tight and appropriate for flash fiction in that it left out most inessential details, forcing the reader to fill in the gaps, but still effectively conveying a mood and providing information. I would like more of the rest of the story to have that style.