Suddenly, you lose control of your feelings and start to cry or laugh.
What would you say then? Sorry my nerves just ....................

Question

Suddenly, you lose control of your feelings and start to cry or laugh.
What would you say then?    Sorry my nerves just  ....................

Answer

got the better of me.
got to me.

Answer

You might say "I just snapped" or "my nerves just snapped".

Answer

I am so sorry. My emotions got the best of me and I could not control myself. Please except my apology.