I think vans suggestions are wise and worth heeding kokki.
In addition, and without intending to fuel your paranoia, it may be worth researching any potential allergies. Your reaction to gases released from foods could have a very real basis. For instance, I work with a guy who is highly allergic to a chemical naturally released by many fruits - particularly bananas and pears. He has to carry an adrenaline shot with him at all time due to this. I suspect all such problems are rooted in liver dysfunction and a problem with one/some of the detoxification pathways. Eventually, one would hope an appropriate RAF diet would resolve this.
I would suggest meditation, yoga, affirmations and relaxation techniques to deal with the anxiety.
We are, unfortunately, absolutely surrounded by toxic loads in our environment, air, foods, water. This is relentless and there are limitations to the methods we can employ to reduce this. Try not to get too hung up on the small things. Focus on building yourself a strong body using nourishing foods that is capable of protecting you from this bombardment.