nausea and diarrhea :(

Florencia
I am 36 w + 3 today and the past few days I have been extremely nauseous and have had diarrhea like crazy. Today I threw up and then 5 min later had to run to use the restroom. My OB is out of town this week and I cannot get ahold of her :( Anyone know why I could be having these symptoms or had them also and can explain to me what the heck my body is doing to me? I haven't had many BH nor have I dropped yet so I'm not sure it's the onset of labor but then again I'm a FTM and know absolutely NOTHING. Lol help??