I had a similar thing until I stopped eating a certain brand of muesli. A different brand with seemingly the same ingredients was fine. I think it's something to do with processing of dried fruit. I believe there was some reaction between that and the alcohol I consumed later in the day. I only realised it was breakfast related on holiday and my breakfast habits changed. I found drinking to be consequence free as opposed to 1/2 a pint causing a certain headache the next afternoon. I experimented when I got home and completely solved my problem.I was also in my early 40s when this happened for what that's worth.
senectus1|1 year ago