i personal have nick named this kind of attack 'rattling the cage' cos it feels like something is rattling my rib cage and everything inside it. i learnt this great trick that works sometimes..... when i can really concentrate. here goes
sit up right on a chair, knees bent, feet flat on the floor, hands resting on thighs and close your eyes.
then slowly begin to tighten every muscle in your body, start with your toes, feet, legs, thighs, arms, hands, shoulders, stomach, eyes, lips, everything and then once its all tight hold it for a slow count to ten.
then slowly start to let go of each muscle again 1 at a time, (i usually work backwards) take a breath in and out with each body part you release (don't take a deep breath just an easy one) i like to finish with my shoulders and feel what it feels like to be completely relaxed even if its just 4 a minuet.