First Surgery!

So I've always had really bad cramps for as long as I can remember, tried all birth control and nothing worked it made it worse! It has come to the point where it feels like a knife has stabbed my uterus and dragged me with it, I have been seeing an obgyn and all he gives me is birth control. Long story short ive switched Doctors and he is amazing but there is a problem it's gotten to the point where I have to have surgery to see if I have Endometriosis. I'm really scared and I would
Like anyone to tell me what it's like or how to not feel so afraid. What was your guys experience?
UPDATE 
The surgery was great! The pain however is a pain and all that has they put in my tummy makes it  a little worse. I can barely take  two bites without getting full because I'm so bloated lol. Other than that turns out I do have endometriosis which was good to hear because of how long it took. But I am feeling better just have to heal.