100 natural ginger chews in one day?? Your body can make you allergic to substances if you overdose on them. It's clever that way. This often happens to people who get a poisoning from something like lobster. Their body will react as if allergic always afterwards.
It may be possible to desensitize yourself by starting with absolutely tiny amounts, like they are doing now for peanut allergy. Only build up to a couple of biscuits though
www.forbes.com/sites/robertglatter/2014/01/31/oral-immunotherapy-may-hold-promise-for-children-with-peanut-allergy/