Asphixiated

Asphyxia (from a- Greek, "without" and sphuxis, "pulse, heartbeat") is a condition of severely deficient supply of oxygen to the body that arises from being unable to breathe normally.
Is it possible for aspyxia to happen without the body feeling it? If not, then what do you call the condition wherein you just saw someone you really love pass by with his/her special someone? You are able to breathe but your chest size suddenly deflates ten times its size or so you thought it did... and then you notice that you're breathing starts getting coarser and coarser... but nothings wrong with you physically... it's just that your world starts to shrink and his/her horizon starts moving further and further away...
And it also happens when you suddenly got laid off from work and you begin seeing red all around... and then you feel the weight of your shoulder feels like a ton of bricks.. you're physically fine... it's not asphyxia they say... and oh so many reasons more could make you feel this way... but the worst part is... if there are no reasons at all... you just sit in a corner and suddenly you feel it... the breathings are heavy but there's nothing physically wrong with you... you're perfectly fine... but then, you're perfectly empty and though your body is perfectly well, deep inside you are asphixiated and there is no remedy for it... if you're body is asphixiated, your body dies... and then you're perfectly still forever, but when your emotions are asphixiated... it never stops... forever...