I have VERY bad anxiety (generalized anxiety disorder, PTSD, and depersonalization) and I'm the same way as you.... I always think I have cancer, AIDS, some rare illness, or think I'm just going to fall over and die or have a heart attack. It's the anxiety putting these irrational thoughts in your head!! The first step you need to do is realize it's just the anxiety talking. It's a cycle...... the anxiety causes fear, fear causes the glands to release adrenaline, adrenaline causes physical symptoms such as racing heart, feeling like you can't breathe, legs weak, shaky, etc. and the physical symptoms of course cause more anxiety. It's truly a vicious cycle. But you need to learn to break that cycle, or atleast get it under control. When you feel a panic attack coming on of feel the anxiety coming on, address it. Tell yourself "okay, I'm having an anxiety attack, this is normal, it won't last long, and it's JUST anxiety" that helps a lot. Another thing is to do things that keep your mind off of the anxiety... keep your mind occupied. I know how scary and depressing it is to live with anxiety, but once you train yourself, you'll eventually overcome it or atleast make it manageable.
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