Please help!

So about a month ago I was diagnosed with a 2 cm complex cyst on my right ovary. It was found because I was experiencing some pain and my gyno sent for me to have an abdominal ultrasound. So once he saw that it was complex, being that it was only 2 cm said to do a follow up transvaginal ultrasound in 4-6 weeks. I went in for the follow up transvaginal ultrasound just recently and was told the right ovary contained no mass or anything. I heard complex cysts don’t usually go away like that. I have heard stories where they did though. I’m still in pain on the right side like it is still there. I’m confused as to why it still hurts. 😕 I was told I have a simple cyst on the left ovary now. Starting birth control next month. I’m thinking there could also be a chance of Endometreosis for me also. Any ladies have any experience like this or any insight would help!