On holiday with family in kzn came back they tested positive during last week. i have no symptoms other than a bit nauseous and mild headache. do i have to go for a covit test?

Yes, get tested: It is important that exactly people like you get tested, so that we can learn of people with just minor "cold symptoms " like yours may actually have a mild case of Covid19. It also let's you know whether you need to keep a full quarantine. You are absolutely correct that it may be just a cold, but combine the fact you were exposed with mild symptoms-that equals get tested!