20 year old female, have occasional chest pain?

Hello,

So occasionally I'll have this sharp pain in my chest that hurts if I breathe in normally or deeply so I have to take really slow, shallow breathes until it goes away, and takes a little while to go away? I have asthma but not bad (don't take anything for it), and sometimes it's really hard for me to get a deep breathe but these two things never happen at the same time.

Don't have a problem with heart burn...

I work a high stress job (CNA) and I've noticed the past few times it's happened at work?

I'm 20 and a woman, the only other time I had chest pain was when I hadn't slept for 36 hours and was having heart palpitations, but this isn't like that either.

Anyone have any ideas? I don't have benefits so can't ask a doctor. Nurses at work weren't any help either.