Why does everything goes wrong when the anxiety starts?

When the anxiety kicks in, It just feels like my mind shuts off everything except the sensory organs so that I could be aware of everything when I do it wrong. Sometimes I becomes so astonished at how even simple tasks feel overwhelming around people that the anxiety stops. Simpme tasks like eating, did I take to much to my mouth? Is it little? Sometimes I even get my mouth full then I will go somewhere else to digest the food and my embarrassment alone. It is not only that, handing Someting to someone, talking, walking, eye contact, etc...

So exhausting 😩