Help!

Chelssie
So I'm kinda freaking out about my period length this month. I have been diagnosed with pcos for about a year and a half now. I've tried metformin, at various dosages, and it didn't work for me. I wouldn't have periods at all on it. I've been off metformin For 6-8 months now. 
Since then I've been having natural periods ranging from 48 days and shorter. Each month my cycle lowers in days. Last month I had a period of three days only which is weird for me, and it was a 35 day cycle. I started my period today, 26 days only from my last period. I went from longer than average cycles to shorter than the regular 28 cycle! Advice please?! And sorry for the novel.