What Is The Treatment For Diarrhea And Indigestion?

I am 19. A varsity athlete on my university soccer team, and recently quit smoking weed after a full year of smoking at least 3x a day. At least once a day around 5pm till the rest of the day I will start getting diarrhea and indigestion. Later at night around 9pm I start feeling a noticeable pain in my left abdomen. It doesn t hurt whatsoever, but is unconfortable. the pain goes away in the morning, but comes back at these times the next day. This has been going on for the last week and I stopped smoking 2 weeks ago. What could this indicate? I think they are simply withdrawal symptoms since I experienced the same thing a few months ago when I tried quitting. As soon as I started playing soccer intensely again I no longer felt any stomach pains or indigestions for that matter.In addition, I have not loss any kind of weight and still eat just as much as I used to. Those are literally the only 2 symptoms I am experiencing. No anxiety or mood swings either.Nor am I an avid drinker I only drink once a week. Twice at the most.