Can Someone help me

Hi all, I've been having on going problems trying to conceive I recently got told I wasn't ovulating and wouldn't be able to have children and I didn't have a period for a year, A few days ago I woke up with blood everywhere and in agony. I went into doctors and they said it could be my period and we did a pregnancy test and it was negative. The day after the bleeding stopped but I am still in agony. Does anyone know what this could be I've never experienced this before. All I know is I feel awful.