Heart palpitations, stress and anxiety.?

22f pretty healthy. No underlying medical conditions. last night before bed I was having heart palpitations and mayb ed a day before that I had some as well. This morning my breast bone hurts and has a weird pressure thing going on. I have alot going on in my life and theres been alot of life changes, could it be anxiety? I had an ekg back in august and it was perfect. Any ideas?