Re: heart beat a bit fast
I wouldn't say it's "normal", but this kind of effect is common. I wouldn't worry about a pulse of 80 at all, since the norm is up to 70 or so.
If you're younger and otherwise healthy, it probably means nothing; but if it worsens to the point it causes you intolerable anxiety, check with your doctor.
"We can complain because rose bushes have thorns, or rejoice because thorn bushes have roses." Abraham Lincoln