Welcome to the forum, kalechips. You might want to avoid those too. Check the ingredients.
The best primer on sulfites is the free ebook by Rick Williamswww.learningtarget.com/nosulfites/book.htm
The old website has changed, so you want to read the original ebook!
Throat getting tight is a bad reaction. You may be developing the true allergy. You really should see an allergist. I'm not a doctor, so I'll assume for this discussion that you "only" have the intolerance. What you need to do is read in Rick's book the part about
how much sulfite is in the foods you are eating. It's not like a peanut allergy where just a touch is lethal. You can calculate the amount in your foods from rick's formula and tables. weight in grams x parts per million = micrograms of sulfitewww.learningtarget.com/nosulfites/knowing.htm
Seriously study this page!
You'll find that cane sugar isn't really too bad in small amounts, about
2 micrograms per teaspoon. The little bit you use making your own bread shouldn't be a problem for you with only an intolerance. It's the "dough conditioners" that are used in store and restaurant breads that are the real problem. If it doesn't spoil sitting on the counter for 3 days there's a preservative in it!
I'm not aware that there is sulfite in cream of tartar. You can substitute with white vinegar or baking soda in some recipes.
Cheese. Are you lactose intolerant? Soft cheeses have little sulfite. Hard cheeses have more, but still not a lot unless you are very intolerant. Milk doesn't have sulfite, but if you react to a glass of milk with nothing added you are probably lactose intolerant. Milk also has a protein you can react to, but the milk sugar is more common.
No tests needed for the food. No test strips. Learn the calculations from the ebook.
There aren't any tests for the allergy/intolerance either. The food journal will help you though.
Many processed foods contain sulfites as whiteners and preservatives, and most of it isn't even declared. Fresh, frozen, canned or ground corn contains no sulfites. It's the processing into starch or sugar that adds it. Corn starch may contain up to 50 ppm sulfite.
Your diet still contains sulfites. Pork especially, and beef have it. Some fruits, grapes and some vegetables like onion family have a lot. Fermented foods are high.
Read tables you can look up. Don't worry about
the low sulfite foods.