I'm struggling with indigestion every now and then.

Last year, I had trouble digesting for a while, and because I couldn't digest well, my intestines also didn't feel good, so I kept going to the bathroom. I went to the internal medicine doctor, who said it was nervousness, and I took medication, but it didn't really help. After an endoscopy, nothing abnormal was found, so I started drinking cabbage juice, and I felt a bit better. So, I was fine until this year, but recently, my digestion has again become poor. I think drinking cabbage juice might help again, but since I can't identify the cause, it's frustrating.