Do see an optometrist ASAP. Firstly, poor eyesight is a nuisance for yourself. Secondly, I guess there's a chance that they won't renew your medical until you get your glasses, if your eyesight happens to have fallen below the required limit.
I don't know what country you're in, but you might well need a backup pair of glasses (if you are in the UK, you do, unless they changed things). Not sure about two pairs of normal glasses and two pairs of sunglasses though - I guess the way around it would be to have two pairs of glasses with clip on shades.