I hope you're feeling better by now, and happy for you that they let you return the fabrics.
I have issues at JoAnn's too, but it's usually at its worst when they get a new shipment in and haul it out to stock the shelves. I'm allergic to the formaldehyde they use in the fabrics...I think it's in the sizing! I walk in the doors and immediately start itching like a dog with fleas! lol By the time I get to the back of the store my eyes are burning and itching. No shower helps, no lotion helps, etc. I just have to wait for it to "wear off". EVERYTHING from the fabric stores goes immediately into the washer when I come in the door!
I've gotten really picky about chemicals in every way over the last few years; in our foods, on our foods, laundry soaps, fertilizers, etc.