How can I avoid crying or losing it in public?

Actually using the same techniques that I use to help with panic attacks, which are: to look for 5 trees, 4 cars, 3 buildings, 2 lamps and 1 flag( it doesn't necessarily have to be these things, these are just examples: just that same order), deep breathing( breathing in 7 seconds, holding 8 seconds, breathing out 7 seconds, holding 8 seconds, and repeating) and finally, like the first method, finding 5 things to focus, only this time things like focusing on what it feels like under your feet, finding anywhere on your body that feels hot or cold, what your hands feel like, just sensory things like that.

Try to disctract yourself. Start thinking positively - about something that makes you really happy.

clench your fists and think happy thoughts to make you think less about crying, but its completely okay to lose it too, if you do just run to the nearest bathroom

I try focusing on an object. I'll stare at it with wide opened eyes. If the tears are still coming I'll laugh it off while looking at my phone so people think those are tears of joy.

I've always taken deep breaths and stepping away from the situation that makes you feel that way. There are many other ways but this is what I do!

You can try to think of some happy thoughts or distract yourself if possible, like talking to someone, etc. If that becomes to difficult, then you could go somewhere private and let it all out. Everyone has their days.

Take a deep breathe and tell yourself it's okay, or try to find a secluded space to let it all out, tell yourself its okay, sometimes we need to

It is important to keep your mind strong wherever you go. Think of the things that make you happy and always move on with a purpose!

Have something to fidget with at all times. This helps take your mind of the situation. Alternatively, think of something happy to distract you. (the patronus rule :) )

Just think happy thoughts. If your walking around with postiveness you wont even think about breaking down.