Possible Allergy?

The other night I woke up around 5am with a really sore stomach. This isn't the first time I've had this happen, though it hasn't happened super often (maybe once every month or two, and it just started happening in the last six months or so). So I'm going to document it here, along with a list of things I remember eating the day before; hopefully I'll be able to figure out what's triggering this (and avoid it in the future)!

So here's everything I can think of that I ate yesterday:

• Morning:
• Smoothie 
• Afternoon:
• Gatorade - regular (the red one)
• Apple Cider from Vanderwees (two glasses)
• Dinner
• Meatball sub from Arnikos
• Wine - Pinot Grigio tetra (three glasses spread over the evening)
• Oat milk
• Caesar salad (croutons from Olive Garden, cheese, Kraft Creamy Caesar dressing)
• 1 deviled egg
• 1 revello
• Evening (around 10:30pm):
• 1 no sugar added candy (watermelon)
• Lays Sour Cream and Cheddar chips
• Gatorade - zero (the purple one, about 1/2 of it)

Some of these things I don't normally eat (like the candy and the revello), so I doubt they are the culprits (unless it's a fluke that they are this time).  Other things I eat just fine most days (like the smoothie and the oat milk). So my biggest suspects at this time are: the wine (though I have had wine at other times and been fine. Maybe it's a question of amount?), the chips (they were late in the day), and the Gatorade Zero (also late in the day. Maybe my stomach doesn't like the purple, or maybe it doesn't like mixing Gatorade Zero with wine?)