How will I know if im actually in labor!???

So I have this extremely weird thing that happens to me where I will get these beyonnnnd horrible cramps for like and hour and a half and then all of a sudden have diarrhea and puke. But these pains are so incredibly strong, EXACTLY like labor contractions! I've told me midwife and she shows no concern to the situation. But I'm so scared that I will actually be in labor and just think I'm having the same problem again and not even go to the hospital and like accidentally have my baby at home!!! Is there any other ways to tell your actually in labor other than the horrible tight feeling in your stomach?