Alison,
I am pretty sure the clinic you need is clinica Guardamar if you google this you will get the address plus a map of the immediate area.
if you cannot get this, the Clinica is on calle del Ingeniero Mira 0 in guardamar ,it is near the Bus Station in guardamar.and quite near to the Santa Anna Poligono Industrial Site.which is just off the N332. Hope this is of use to you.

Thank you very much for the info Alan! Will do - this time googling the street instead of CAP....