Vitex for irregular, long cycles?

Ho
Hi!  
Just started reading about Vitex. I have always been very irregular (today is CD 53...) and obviously that is challenging when TTC. I am tracking bbt and doing opk daily as well. 
 My docs once gave me progesterone to bring on my period when I was 18- I bled for weeks and it was literally uncontainable. I want to avoid that again and that's my next step if I hit CD 90! 
Can you share experiences with Vitex in regulating and shortening your cycles? Hoping Vitex might be able to help get things going on my own. 
Thank you!