I get this way, too. My solution is to do whatever I can to get through the work or school day without a meltdown until I can get someplace where I will be alone for a few hours. Once I'm alone and safe, I let myself have the meltdown. For me, it's better to get through it because if I don't, I will be on the verge of a meltdown for days, and it might happen without my control in a public place or where I will regret it. Once the meltdown is over, I can recover from it and feel better, and no one had to know that it happened at all.
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You don't need to hide, my friend, for I am just like you.