It seems quite a big allergy you developped. Try useing histamine blockers like SveniPolen suggested
Why use chemicals when garlic is the best thing, I can tell you now, I suffered for years with bits, the last time before I started to take the garlic was that bad my ankle swelled up so I couldnt walk..after that I eat garlic before and when I was away and nada! not a thing..they dont come near me! ..Call me stupid, but there may, just may be a reason why the Greeks, Italians and the Spanish have always had loads of onions and garlic in their diet and the French for that matter..