Cant handle having a period!

Peta
Im 20 years old and got my first period at 13. 
Since i got my first period i have been prone to getting cysts, more so on my left ovary. And it is so painful that i cant walk most times when they do appear, doctors dont know much about endometriosis or ovarian cysts, i wanted to know if there are any girls out there who have experienced the same thing and how do you deal with it? I have to try my best not to havea period every month only having one every three months. Let me know girls!