25M- Is this a sign of colon cancer or something else?

I’m 25 and have been dealing with some weird bowel issues for about 2 weeks, and honestly I’m pretty anxious that it could be colon cancer.

It started with a few days of diarrhea. I took Imodium, and after that I became pretty constipated. Since then, I’ve had on-and-off stomach pain/bloating and have sometimes only been able to pass a small amount of stool.

At one point I was really constipated and had to strain pretty hard. After that, I noticed rectal bleeding. It happened maybe twice, and one time I noticed bright red blood in the stool. Thankfully, I haven’t seen any bleeding recently.

Right now I’m still somewhat constipated and bloated, although things seem to be slowly improving.

I already have a doctor’s appointment coming up, but I’m really nervous about what they’re going to find. I’m 25, and I know colon cancer is less common at my age, but I’m still scared because of the bleeding and change in bowel habits.

I’ll also admit that my diet has been pretty bad for a while. I eat a lot of takeout/fast food and not nearly enough home-cooked or healthier meals, so part of me is worried that it’s finally caught up with me.

Could this potentially be something like hemorrhoids or an anal fissure from the constipation/straining, or something related to the Imodium? What other things could cause these symptoms?