Hypochondriac and i need help

Hi, I am 20 years old and i have hypochondria really bad. I think something is wrong with me every pain I get. I have anxiety/panic really back so my chest hurts and now i think i have heart problems even when three doctors have told me my heart is fine. I had an EKG, chest x-ray and blood tests done and everything came back good except that my doctor said i had GERD (stomach reflux) and anxiety. Is there anyone who can help me or give me any advice? this is ruining my life because i constantly think something is wrong!