I need to throw up super badly and I retch and can feel and definitely hear my stomach contracting, however, when the throw up reaches halfway up my throat the momentum stops and all the throw up slides back down my throat. The sensation has become unbearable and has been happening non stop for over half an hour now. What could be causing my stomach to refuse the contents but not make me throw up entirely? I m so nauseous and my body won t stop retching and I have to get to sleep tonight!!!