Whenever i drink alcohol, i wake up in the morning with almost diarrhea/ stomach cramps. normal? is having a glass of wine everyday bad?

Then maybe don't: drink. ALcohol is a solvent and irritates the stomach lining. This is worse on an empty stomach and if right before lying down. Alberta, Manitoba or Quebec ? otherwise you are below the legal drinking age in Canada. Without an actual examination, I cannot give specific medical advice on your particular health

Gastritis: Alcohol can be corrosive to the stomach lining. Some people are more sensitive than others. In your case alcohol seems to cause untoward reactions, it is best to avoid it.

Normal, for you: In most people this does not happen, but there is a physiologic reason for when it does. The alcohol gets quickly absorbed by the intestinal cells, which then shut down absorption of water from within the intestines. Therefore, there is extra water within the intestines, which comes out as diarrhea. One glass of wine a day, may be beneficial for your heart arteries.