I had charcoal tablets on a long haul flight once as I was sick.
They made me worse and everything went black, the vomit and everything else. They have to be one of the worst things I have ever used.
Have you tried any yoga techniques? There are many wind relieving postures that really work.
I use probiotics, they make my tummy feel well but I'm still very windy! If I'm really bad I use Buscopan too as this relaxes the bowel and gut.
Hope you get some relief soon.
Shellb
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