Hello!!
I'm allergic the yeast and have very similar symptoms to you (and then some) when i eat or drink anything containing yeast. since i found out, i have cut out all products that contain yeast and my symptoms have stopped. If it is yeast that you are allergic to, dont forget that it is included in fermented and other products like OXO cubes, some dairy, some sauces, bread, soya sauce etc.
as your symptoms have stopped since you stopped drinking beer then maybe it is another ingredient? as your probably eating other foods with yeast in it, without symptoms, you may be allergic to barley?
what are you like when eating bread?? i totally avoid it. causes too many problems for me.
hope that helped