Why can't doctors find anything?

Crystal

Just seeing if anyone else has experienced this. I've had severely painful periods since mine started 14 years ago. To the point I cant move or get out of bed and no pain killer helps and I throw up. Its so bad and when I talk to people I know with endemetriosis and cysts they experience the same thing I do. But every time I go for scans and a check up, everything looks normal and they cant find anything.