I feel like I'm dying?

At random times. No matter where I am this happens:

I'm normal, just thinking. I can't breathe. A pressure is in my lungs, my lungs are failing me, I gasp for brath my mouth opening to take it in. My lungs breathe it in starving for more, I gasp and try to pull all the air in my lungs bu I feel like I can't breath. I breathe faster, rather then deeper to get the oxygen in.

It's indescribable, it feels like I'm dying, like im being suffocated. When this happens I sometimes scream with fear or cry. It's terrible. It doesn't happen with fear, just randomly. Don't say to ignore it, you stuff a bag down your throat and tell me how fun it is when you feel like your about to die and have a pain in your lungs.

It's not health caused, my heart speeds up but that's it. It's more like my brain just thinks I'm about to die and tips tryin to save itself. It's really scary, what is this? Does anyone know what to do

Also deep breathes and meditation don't help, so none of that. It's beyond some relaxing.