My stomach hurts when I get up early. How do I stop that?

999freakshow
OK I'm at university and my schedule is really messed up. I have lectures from 14:00 to 20:00 one day and the next I start at 8:00 and finish at 16 and so on... it's different hours everyday and I have a hard time falling asleep at the same hours each day.

The days when I have to get up early, my stomach really hurts, on the way to my university, sometimes even longer. (takes me 1hour and 30 min to get there. Is there a way to fix this? anything I can do to make it stop? My eating habits are fine and I work out twice a week...
My stomach hurts when I get up early. How do I stop that?
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