15M, bad stomach

So it started when my family and I went on vacation this summer in June. We all experienced diarrhea, but others soon recovered.

During the rest of the summer for me, I had to poop around 2-3 times a day often directly after eating, while before I only pooped 0 to once a day, but they were normal in shape and brown in color which is normal for me.

Now I didn’t really notice much because my schedule was irregular during break, but now that school has started, on week days I feel the need to poop at noon and often I have stomach spasms in the morning, but when I sit on the toilet only gas comes out. I only manage to poop at noon, and my stool is always a shade of yellow, around 4 or 5 on the chart. Before the summer it was almost always brown. Also worth mentioning that I feel perfectly normal for the rest of the afternoon even after I have lunch. The spasms only come back after dinner. My digestive system is also much weaker, and I often have a bad stomach after eating outside. My stool would be type 6, with hundreds of little pieces almost uniform in size floating on the surface. Also my butt sounds like a chainsaw sometimes when I sit on the toilet. When I lay on bed at night my bowels are always moving and making noises and when I go on the toilet nothing comes out except for gas, sounding like a chainsaw. I already made a doctors appointment, just wanted to see what you guys think.

Diet: during the summer after the vacation, I hung out with friends nearly everyday and ate a lot of fast food. After school started, I usually have a fruit flavored breakfast bar for breakfast or none at all. Burgers, fries, or fried chicken for lunch, and rice, veggies and meat for dinner. Ice cream and chips as snacks as well.

I also experienced a weight loss of around 10lbs in the summer, partly because I exercised and was outside everyday. Now I am gaining back the weight at around 143lbs, height around 5’8 to 5’9.