what really helped me keep from going from 0-60 as i called it was taking a dbt class. it is meant for borderline personality disorder but it is geared toward emotional regulation. it is about staying in the moment and using mindfulness. i dont really go for all that mindfulness stuff in its truest sense but the class worked miracles for me. i no longer go off the rails when i am stressed anymore. i dont even think about it in the steps anymore to be able to explain it to you (sorry). it is just part of my life. you can find some very good workbooks online to get you started. i can share some anxiety reducing techniques i use though.

i have this thing called an anxiety meter that i visualize in my head. it goes from 0 to 10, 10 being the worst anxiety ever. so when i am anxious, i see where the needle registers on the meter. then i do breathing exercises until i get it down to a four. which is manageable for me. sometimes i see a knob on the meter and i will manually turn down the meter to four so i can calm down faster. practicing this enough, all i have to do now when i am anxious is say dial down, and i can calm myself.

i have a technique i use for unwanted thoughts. i have a door at the front of my mind and one at the back of my mind. the thoughts come in the front door and the only attention i give them is to notice them long enough to escort them out the back door. they are like clouds drifting through. i do not become attached to them, the only thing i think in my head is "thats it, out the back door". i will even visualize the thought being thrown out of my mind like a bouncer throwing a drunk out of a bar.

i hope these help.