what is happening, as i am walking shopping and so crowded place, suddenly when i want to go back, i can't walk, my both legs feels so weak and can't move, it is so stiff, i must drag it, and half way i feel i am not walking, like floating or waht it scared me, then my chest, heart felt so tight and stiff too. so scary what is this. lastly i feel so light headed and can't control myself again, i feel so lost like where am i , why is this always happing, what should i do then if this happen again?