One strategy I use to stay calm during the day is.....

Taking deep breaths.

Solution for a BPD like me..

Having a pet to cuddle is, in my opinion, is the best way to calm down. They arent too ridiculous like people, nor too quiet like trees. -> decrease ur social skill..

Listening to soothing music is a way too. But I dont recommend musics that talk about your problem, either encourage one or express one. You may feel better at some point becuz u feel like u re not alone/some one understands u, but in fact it will make u eventually feel sadder and think deeper about it, as the melody usually a trigger one, at least for me. -> works everytime to control emotion but will make it change easier depend on the music. Imagine in a classroom with emo teenage music on...Lol

The last way I do when there's no other way out, and the least one I'd recommend, is... I would choke myself until my mind goes blank. This help u calm down quickly, but it will make u addict, make u depend on physical pain, make u weeker to emotional pain, make ur mind unstable and affect your actions in the future so.. try not to do it if there's still other ways for u :3

Well, any better sugestion fork :?

Chewing minty menthol chewing sticks when I'm stressed or nervous. The menthol helps me stay cool

Focus on breathing.

I'm still trying to figure that out.

I try to be mindful of my agitation and take breaks to reset.

I don't even know

Taking it easy

Deep breathing, listening to calming music or write in a journal

Joke around with a friend or have a cup of my favourite flavored tea or hot chocolate