Help me with my anxiety?

First off you've made a really good first step in identifying that the thoughts you've been having are irrational. Yes it can be very stressful when things like this happen, however knowing about your hypochondria can help you identify that the feelings that you have are not rational and there is no real reason for your concern. Take deep breathes and with each breath imagine all the worries you have inside you are just being blown out of you like a pump. Breath in through your nose and out your mouth. Something you may want to consider is seeing a psychologist or maybe even a doctor or psychiatrist. They can help immensely with anxiety issues, and could give you some short term medications if it gets too bad. And seeing a psychologist could really help to sort out all your worries and fears in an effective and positive manner and keep it under control.