Intense bowel activation in the morning

Hi all, I’m struggling for a long time with large activation in my bowel, but only in the morning, couple of minutes after I wake up. It wouldn’t be a problem, but it often causes my stools to be very loose/diarrhea, it is also connected with developing some food sensitivities (like I can’t eat milk as it upsets my stomach the day after even more). Has anyone has went through similar issues? Would you have any tips on how to deal with it?