Is it normal to feel scared?

For the last year and a half I have experienced a constant dull ache in my groin area, I have ignored it for a year and half now but finally went to a doctor, she gave me a pelvic exam and said it feels like I could have a cyst so she sent me to the hospital for a transvaginal ultra sound, at the ultra sound, the doctor said I have a large cyst on my left ovary, she told me to come back in five weeks to see if it is still there as she said it should dissappear by then. I know doctors always know best but I know this cyst won't dissappear, I have had this cyst for a year and a half because I have had the dull ache, bloating, feeling breathless, and feeling weak and tired, also have suffered with anemia three times now, it keeps coming back. I had blood tests, they only tested me for minor things such as celiac disease, diabetes, anemia, throid. I feel like I'm not being taken seriously or listened to. And now I'm starting to sound like some drama queen as I am so worried and feeling so ill. My family and friends have said its nothing and I'm being silly, although they are always saying how tired and ill I look. Am I just worried for nothing? What could this cyst be? And when I do go back in 5 weeks and the cyst is still there, what happens next? I just want some advice.