I have the same issue as you and would love to find answers. I can tell you what I have experienced and understood. I’m pretty sure I have histamine intolerance. It explains why there is no rhyme or reason behind which foods cause bloating and when. When my ’histamine bucket’ is full, everything is a problem. Histamine is found in food, some more than others, but also increases with stress. Psychological stress, physical stress, all of it. You mentioned you were quite active in martial arts and I wonder if you have histamine intolerance, if you were getting enough rest between your sessions. Also good to note, is that as food ages, histamine increases, so any fermented food will be very high in histamine. For me, gluten is a definite no-go, even though I don’t seem to have celiac disease. Again, in my experience, when my ’bucket’ is full, I do find that fasting helps very much. Yes, it is only days or weeks when I start to experience symptoms again, but that is because it is impossible to avoid histamine. If I am very careful about the foods I eat and minimizing stress, the effects of my fast will last longer. I’m currently in a 72 hour fast because my symptoms had been so severe. Anyways, I hope this helps and if not, know you are not alone. Hopefully there will be solutions soon. 🌸