Nasty after taste 🤢

Jasmine

So after I eat anything even like saltiness cracker an after taste sets in that makes me nauseous and wanna gag. Any help on what can help this this is so annoying I even stopped drinking my coffee because that leaves the worse taste out of everything. I drink lemon water all day and it helps a bit but not as much as I would like. This is driving me nuts 😩😩