For The Past Few Months I Have Had So Many

For the past few months I have had so many weird symptoms. I'm so worried that I might have cancer. I've loss approx 12 lbs from Nov to now. I've had heart palpitations, nervous, tight chest from time to time, light headed, I feel like I'm going to pass out. Today I feel a pain in my upper - back. Like pressure inside and chills. My doctor has done cbc and tell me I need to see a therapist because I have anxiety. I don't believe this is anxiety. I am terrified.