Yesterday evening the right side of my mid back hurt (as though from back pain) but when I sat down it went away, however it had this weird feeling as though it was "bubbling"? Then earlier today I had a sharp pain stab through the right side just under my breast (where the breast bone is?) and it shot all the way through to my back where it had been hurting last night. I just got it again 5 minutes ago. I was sat down on my laptop when it occured just now, and stood up earlier. Doesnt seem t ohave a pattern...

What could this be? I am and 18 year old female not taking any medication.

Thanks!