This is Dr. David
it sounds like you have excessive anxiety about germs.
1. no, you can't get sick or die by passing people at the airport.
2. yes, a simple warm water bath with soap can kill germs. better to take a shower.
3. there are germs on luggage and phones, but you have an immune system which fights germs and keeps you healthy. you have bacteria and germs on your skin, on every surface of your house. but these germs and bacteria don't get you sick because your immune system is working.
4. yes, you should see a therapist and a psychiatrist. there are medications like sertraline or paroxetine which can help decrease your anxiety about these germs.
let me know if you have other questions.
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