Step one: breathe normally. I know it feels like youi can't breathe, but it's just because of the panic, you should just take a few deep breathes to get the oxygen, then breathe normally. You'll be alright. Step two: whatever you;'re panicking or anxious about will not hurt you, and you can probably fix it really easily, so don't over think it right now, try and work on it over a longer period of time. Step three: If possible, get a change of scenery. go to a librfary, or even the bathroom. it can help you cool down. Also, after a panic or anxiety attack, your body will be full of adrenaline, do it's normal to still feel skittish or panicky after an attck. You're fine.

If you need any other advice, I'll try to help.