My best friend and I got in a fight two months ago and during the fight (texting), she said some really mean things to me..?

Two years ago I was diagnosed with depression. I ve been feeling depressed again but im not sure. Im still really hurt by what she said to me and still cry myself to sleep. My parents have also been fighting alot at home. Recently, ive had 30 second episodes where my breath gets very quick and I start shaking I feel really scared of my friend (we have all our classes together so shes Often in the same room as me). All I have to do to calm myself down is focus on my breath and tell myself, "you are safe. No one can hurt you" im really confused. Whats happening?