missing period for 3 months, is this normal?

i'm 14 years old and i got my first period in july of last year. then i got my next (and last) period in the beginning of october. there is no chance of me being pregnant. could i have pcos? or something else? or is this compeletely normal? i'm so scared and i have gotten multiple (which i assume are) panic attacks in the last couple of days. i am on accutane too at the moment for my acne. now i'm scared i can't get rid of my acne either. please someone help me.