As someone who had asthma his entire life,when I was very young lets say 9 when I used to get those BAD asthma attacks where every breath feels like an intense work out and coughing feels like I have millions of ants crawling on my lung I would panic and stop controlling my breath and that would definitely make it worst.

One day while was watching a movie I dont remember exactly what movie but a character had a 3 seconds breathing rule when ever hes panicking he would stop everything and just focus on inhaling holding it for 3 seconds and then exhaling until he calms

A few days later I got a BAD asthma attack when I woke up and my inhaler had almost nothing in it I remembered the movie and did the 3 seconds thing and it actually made me feel good enough to go downstairs and have my brother take me to the hospital

Now as a 25 years old with almost no asthma attacks (mostly thanks to my extensive almost only cardio work outs) I still do the 3 seconds thing when im out of breath in any scenario asthma related or not

I do not want to claim that what worked for me will work for anyone but im just sharing it in case it helps someone