Maybe you are allergic to the the Simbicort. I would suggest talking to your physician about an alternative inhaler medication.

Sorry you are having this experience when inadvertently getting Gluten. I have used 3 ounces of water with 2 tablespoons of Apple cider vinegar and 1/2 tsp of honey mixed well and drink. I have also used Nature's Way organic Apple cider vinegar (ACV) Gummies. Bottle says, take two. This is great when I'm out and about and carry them in my handbag. I got them through Amazon. This has made huge difference with all the symptoms mentioned.

Yes, I rinse my mouth twice, brush tongue, and gargle twice after using the inhaler.

Welcome to the forum, @Iris Kraft! Are you remembering to rinse your mouth out with water after using these inhalers?

Sorry, I wish I had some good advice. When I make mistakes like this I get violently ill after about 2 hr. with intractable emesis for 2-3 hours, awful gut cramps,  followed by several hours of diarrhea. I don't know of anything that really helps because I can't keep anything down.