Postpartum Diarrhea

Jessica
My little one is about 2 weeks old, but for the past like week i've been having awful diarrhea! I don't really understand why, after i delivered i had a normal bm the next day and everything was fine, but for the past week everything i eat is going RIGHT through me and I'm having the worst gas and gas pains. 
Like i'll eat something and literally 10 minutes later I'm running to the bathroom to poop it all out, and the gas pains are awful. Is anyone else having this?? Is it normal??