sick and dizziness ?

So for a few days now I've been having a stuffy nose and a cough, not too horrible cough here and there but constant runny nose so I've been laying down a bit and every time I get up even if it's for a long period of time I get really light headed and dizzy sometimes I even burp as if I'm gonna vomit. I thought it was just a cold but now I'm starting to think differently, should I make a doctors appointment or should I not be too worried? 😕