I want to quit work because I had a meltdown yesterday and I feel so ashamed of my self

my parents always thought me to push through and keep going but it's hard for me. I don't remember exactly what happened but there was this very rude customer and I had a meltdown and I ranway. I almost went home but the shift manager caught me in time. I didn't even care if I get fired.

at night I couldn't sleep and now I'm at work and I feel very sick

I am so ashamed of myself