Anxiety causes panic attacks. It's because of this that if you have anxiety disorder then you will experience panic attacks and some of the things you are saying makes me think that is what is going on.
What is very interesting (I mean that in an empathetic way) is that when you eat, it get's rid of the "texture" of what you are breathing.
If possible, if you can afford it, get an air filtration machine. The reason why is because you will logically know that the air is "clean" around you and this will help you start to see if there is something in your house/area that you really are breathing in, or if it's just a mental issue.
Feel free to message me if you need too I can give you some tips/techniques to help with the anxiety if you have it (and it's not that you have mold or something in your room, another thing that you can check for and it's inexpensive) and recipes for herbal tea to calm you.