I think this must be what an autoimmune condition might feel like.  I often see people who have this hunted look about them.  Life for them is like tiptoeing through a field of landmines.  A food that was fine yesterday might cause a massive reaction today, is it pollen, dust, the moon phase, the dog?  Their liver, histamine, hormones?  Something in their environment or inside them is harmful for them but they often don’t know what and therefore how to avoid or control it.