Painful and heavy bleeding with clots

[Sujita]

This is the first time I am posting here. I went to doctor for check-up and he found cyst on my left ovary and told me to test CA-125. He told me to come again after 2 months with report. I always have irregular periods like after 3or 4 months . Now. I have period and it's been already 18 days and I am bleeding with clots and very painful cramping in my abdomen.i feel like I'm going to die. He told me to have medicine and if it take away the cyst then i don't need to do surgery otherwise I have to do surgery. I am confused that is bleeding is happening because of the medicine ? Please let me know if anyone goes under this problem