There are many websites relating sulfite allergy information, look at all of them. Sulfites also cause my heart rate to accelerate, and I can get short of breath. Here are some of the basic foods containing sulfites, which you must avoid:
corn starch, corn syrup, lemon juice concentrate, frozen/dried potatoes (including restaurant potatoes, such as french fries, only eat fresh potatoes), molasses (except unsulphured molasses, which the label will specify), caramel color, all vinegar (except distilled white vinegar and rice wine vinegar). These things are found in so many foods it seems impossible to stay away from sulfites, but you can, you just have to really work at it. Also, chocolate, dough conditioner, and cheese all contain sulfites (although cheese contains such low levels that it is barely noticeable to most people, but maybe you are just that sensitive--the older (aged) the cheese, the more sulfites it has, so buying fresh mozzarella compared to the processed kind might make a difference for you).
Hopefully by now you know the names of the sulfite additives, such as sulfur dioxide, sodium sulfite, sodium metabisulfite. Basically, stay away from anything containing the words "sulfite" on the label.
Oh, and grapes! Stay away from grapes, including anything with grape juice or grape juice concentrate in it. Although the FDA has banned sulfites on fresh produce, grapes are exempt from this, so long as only every other package contains sulfites (grapes have a history of being preserved with sulfites, which is why they are allowed to continue with it--it is tradition. This is a little known, but true, fact.)
Also, biotin, found in most multivitamins, increase sulfites in your body. Stay away from it. As well as limiting garlic and onions, which are high in sulfur. And stay away from MSM, a supplement sold at health food stores, supposed to be good for arthritis, but is pure sulfur.
Hope this helps, it only touches on everything, but at least it covers the basics. And don't listen to the doctors if they poo poo your sulfite allergy, mine wouldn't listen, they thought I was crazy, but I stopped eating sulfites, and my life totally turned around for me. It absolutely makes a difference.
Oh, one last thing, stay away from powdered sugar (which almost always is mixed with corn starch). Be careful of sugar in general, stay away from it if you can. The most pure sugar you can find is best, like organic cane sugar. Hope this helps.