food are stress triggers?

Well trying to get this right!!I can eat the same foods and have normal bowell movements and then the next day eat the same food and have the D and times i can drink coffee all day and have noraml bowell movments then other days loose stools like today my bowell movement was noramal in color and everything else unlike yesterday i had yellow D i did finlly sleep in today and stayed up late last night so i wonder that change my normal bowell habbits of getting up a 4 am to go to work..And if stress plays a big role on how the next days bowell movment goes like yesterday i had a hambuger for lunch wich i new it would make me sick and dinner pork chops and didnt get ill but there are times i can eat that same thing and become ill so i wonder in stress has a role in this and how your day goes and what type of thinking you are having that day see when i wake to get ready for work iam a little stressed on how my bowells are going to treat me for the day and how my morning bowell movement is going to be al of now i have been having muscle spas in my shoulders and eye lids and by bwells do it with it with it i know stress causes muscle twitches