Hi. With so much of physical health issues one tends to think the way you are but if it exceeds a normal limit, it's not fine. Good news is these thoughts can be controlled and this irrational fear too. See a psychologist near you and she or he will be able to guide you in understanding these fears and further help you to move beyond them. Don't Google your symptoms as you will start behaving the same way as mentioned, unconsciously. So it's better to see a professional and start working on it. Hope this helps.

U need to consult a Psychiatrist and get Medicine along with counseling. It will surely help in getting speedy recovery.