Irregular period schedule

So I noticed that my body has become very out of sorts for the past couple of months. My period has been off schedule. I haven't had my period for two months twice and it's scaring me. I have had a very stressful start for this new year so it may have something to do with my emotions but I am not sure. Am I okay? Is there anything I can do to help regulate my cycle again? (Im 16 by the way)