Can Kombucha promote Gastritis?

Good afternoon Ben, I have been brewing my own Kombucha for 3 months now and have been drinking it since then every day before breakfast. But I started to feel some stomach ache and I stopped drinking it every day to just once a week, and unfortunately, it still giving me some gastritis. I like it sweeter and I normally add fruits like strawberries, grape or blueberry and always ginger when I separate it to drink.
Am I doing something wrong?
Thank you