What Causes Squeezing Feeling In The Upper Cavity?

Hi, I have a grandaughter, age 18 who was taken to the hospital feeling faint, passed out on the way there. Her symptoms are a squeezing feeling on her left upper cavity, something feels like it s pushing on the left side of her chest. Sometimes she is gasping for air. Her pain is a level 9 and she feels like the pain is a thousand nails that goes from her left side to her back. She is getting weaker. Doesn t want to eat, very tired. They have run tests so far everything shows normal. No heart problems, etc. She does have asthma but this is way beyond an asthma attack and she has been in the hospital now for 3 days and they can t find out what s wrong with her and she is getting weaker and in more pain. They give her breathing help but nothing is relieving her symptoms.