I have the same exact problem and my way of dealing with it is an extreme elimination diet. It's hard, but I can sleep, and I'd rather sleep than pig out on food. Gluten, sugar, spices and a myriad of vegetables and grains are triggers for me.

Also daily saline nasal rinses and I can breathe better than ever, though diet is what does the most work.

My pet theory is years of junk food precipitating into IBS and leaky gut, so only the food that cause fewer reactions are ok. In a healthy body some "toxins" are tolerated and don't cause issues, but when your gut is fucked you need to start from scratch.

My case was very bad to the point I was also losing my sense of smell so I had to have a surgery. It's a laser procedure and it worked like a charm.