What Does Frequent Vomiting Bile Like Liquid Followed By Passing Stools Suggest?

Hi i am a 42 year old female. I am burned 75% of my entire self, but i don t think that has anything to do with how i have been feeling every couple months. I wake in the middle of the night feeling so hot that i feel combustible. I throw up only bile looking liquid and a bowl movement almost simultaneously, it s a terrible feeling, i will do it 2 to 3 times that morning, like i did this morning and then it s basically over after i get a few hours sleep. Right now i feel a little weak, but not nauseated or hot. Tomorrow I m assuming I ll feel normal again, but i don t understand why i keep going through this. Hope you may have some ideas, thank you. Cristina