okay I'm a 14 year old girl, and every time I breathe my right rib feels like it's collapsing inwards on me. 

I went to the hospital around 12:00 at night and they checked my breathing and air flow and they said it's fine. Then I went home woke up in the morning and Yet its so hard to breathe again and to get a full breath I have to breathe in really heavily. 

The only time it doesn't hurt is when I stand up or walk around. When I sit or lay down it feels like I'm suffocating. It just hurts, and I have a very high pain tolerance. Idk what it is, or what to do...