allergy to garlic

I too am allergic to garlic. I developed this allergy about 5 years ago and it took me a while to work out what was causing my stomach cramps/spasms. If I ever eat garlic by mistake it really upsets my digestive tract causing spasms and makes it very painful to eat for 7-10days afterwards. Garlic is in so much food it is really difficult to eat anything unless you cook yourself from scratch. Eating in restaurants is normally a nightmare especially as I am also vegetarian. Normally only 1 thing I can go for on the menu and quite often the chef will have to make up something bland. Even salads can be tricky as often garlic in the dressing. I hate having this allergy and am always having to check every label. Anyone have any ideas on helping with this allergy? I wonder if I will have it for life and if Onions will be the next thing?