Mood swings?

I'm 17 and have had my period for about 4.5 years but I feel like my moods have been worse than ever for the last 5 days since my period started! I was overly emotional a few days ago and have swung between feeling down, then happy and productive/driven and then down again today! It's really frustrating - any tips/ideas about the cause? I know periods can be the cause of this but it's never happened before! I'm also very quick tempered at the moment 😁