Answer:
Your friend explains that his anxiety feels like a giant rock is pushing on his chest, keeping him from moving. His anxiety also feels like he is trying to cross a busy highway, but there are too many cars quickly passing by, making it impossible for him to cross.
Because your friend used concrete nouns such as rock, chest, highway, and cars, you now have a better understanding of what the abstract noun, anxiety, must feel like. Now you know how to help your friend because using these different nouns together helped you both communicate effectively.
