My Constant Upset Stomach

I know Ive mentioned on here multiple times how much I neliebe anxiety & stomach issues are one in the same. But I'm wondering if my constant stomach problems are more than just my anxiety. I know I am lacrose intolerant (yet will induldge...often). I'm not overweight by any means (5'9, and about 130 lbs) but I eat. A LOT. for example yesterday I had a breakfast sandwich from starbucks, a bagel, a piece of grilled salmon for lunch and then a protein burger for dinner & cookies for dessert. I didn't have any digestive problems last night but today I'm feeling extremely nauseous and have been back and forth to the toilet all morning & afternoon. As I re read what I wrote it makes sense why I feel like crap today but sometimes typing it out helps be be rational.

I should also clarify that I meant to type "believe" not "neliebe." Perks of typing on a cracked iPhone.

Thanks for the suggestion, AngelLisa. I definitely want to talk to my doctor to see what I can do but i know he's going to say "breakfast sandwiches, bagels, burgers, cookies and salmon" are the culprit. I need to change my diet for sure.