The 44-year-old actress makes her second on-screen comeback as Sharon Rickman (previously Watts) on Phil Mitchell's doorstep next Monday (August 13).
Speaking to the latest Radio Times, Dean despaired: "I've got my special eye cream. I mean, HD is so cruel, isn't it? Who invented that? It must be a man."
Of going back to the Albert Square set after six years away, she admitted: "I still got the first-day-at-school nerves, when your stomach's flipping over and you feel sick."
However, she also revealed: "I'm having such a lovely time, even getting up at 5.30am isn't jarring yet."
An EastEnders producer recently stated that Dean's new deal took a year to be finalised.
Dean has said that she "eased back" into the role after "first day" nerves.
Watch a trailer for Sharon's return below: