Chest hurts when breathing?

This morning i woke up and at one point, i breathed in hard and felt a sudden sharp pain in my chest, right above my bone. It wasn't a bad, overbearing pain, but it did hurt a little, and it was only that one time. I was fine this morning when it happened, just getting ready for school like every week day. But all day, there was an on and off bad pain in my stomach, which was odd, but i ignored it. (don't know if this may have something to do with it?) Then, after i got home from school earlier, something happened at home which really upset me and i started crying really hard. Ever since i started crying till now (its been about 2 hours since its started), my chest hurts really bad. Its just like this morning, but a lot worse. If i breathe in and out okay, it only hurts a little, but if i breath in too hard out exhale too hard, theres that really sharp pain again. If i walk around or move a little bit, it hurts too, even if I'm just breathing normally. Do you think its just stress from crying and what happened? Or what? What should i do?