[Suspected IBD] I can't eat anything without flaring

I'm a 20 yo male. Being considered for colonoscopy. Lot of GI issues, today it's mostly diarrhea with blood and mucus sometimes (recent onset), and lower left quadrant pain (extreme fatigue too). Nothing is showing up on blood test (except for anemia) and on CT scan (except for a lung bronchiectasis). Fever whenever the condition is "active".

Sometimes the disease will stop or become less intense but whenever I eat / use / have one of the following it "flares" again :

• Dairy. Any dairy.
• Gluten.
• NSAIDs. (ibuprofen, any -fen thing, aspirin)
• Whole grains.
• Greasy foods.
• Stress.
• Not enough sleep.
• Antibiotics.
• Some processed foods.
• caffeine.
• Carbonated beverages.
• When I eat a lot.
• High INSOLUBLE fiber diet. Soluble fiber are fine. The worst being : Gluten / NSAIDs / Antibiotics / whole grains. (by far)

Can anyone relate or help ?

Thanking you a lot for your answers !