How do I stop being a hypochondriac?

Well, first off I'm scared of all poisons and wouldn't go near it unless someones around me to make sure I didn't ingest anything. Second of all, I can't go to sleep without gargling water to make sure my mouth is clean so I'm not poisoned. I have panic attacks. And whenever I read some poisoning symptoms, I start thinking that I have it. And right now I'm obsessing if chipped nail polish is poisonous or not(because some went in my mouth) What do I do? And please, no rude comments.