Is it normal to worry after being told i could die after a doctors office visit?

last week i was constantly tired and my head felt like it was gonna explode. when i would stand up,my body would get hot and my vision faded sometimes,and sometimes it felt like a rush,and i would start to stumble. so i go to the doctor and he tells me my blood pressure is low,so low that he said something about being a few points lower and it would be so dangerous i could go into shock/coma and die. when i was their i didn't to much of it,but now looking back thinking abut what he said,i'm scared to death now. i'm litterly shaking in fear of not wanting to die from low blood pressure. is it normal to feel like this hours after i went to the doctor? thanks for any input you may have