I just randomly get this feeling where I’m almost like trapped in my body. It feels like my lungs aren’t big enough to breathe or they are being compressed by my rib cage. It also feels like I’m sort of trapped in my body or it’s not big enough for me. I feel uncomfortable in my body when this happens 

It is random I believe, it happens a lot when I’m actually not feeling anxious actually, and working out or eating/drinking sometimes helps

What is this?