I am a 28 yr old male, heavy smoker, kind of inactive. I get occasional skipped heart beat sensations, But I was at the computer today, smoking and having coffee, and all of the sudden, I felt a very profound out of sorts dizzy feeling. Sort of like a light headed brain clogging type feeling.. hard to explain.. There was no pain, but felt what i think was fullness or something in my head. It was a very strange and scary feeling, it lasted about 3 seconds or so then went away. Dont believe there was any other symptoms. It felt like the blood got cut off to my brain for 3 seconds or something. I was thinking maybe this can be a mini stroke? I do have anxiety problems. I check my pulse alot sometimes not even consciously, im not too sure if i had my hand on my neck or not checking my pulse.. I think there is a possibility that i perhaps was putting pressure on my carotid artery not realizing it.. but thats just a guess.