A bit worried now 😥

So for the longest time since I can remember I always had two types of body fluids in my mouth, saliva and mucus...I thought the mucus was normal but I’ve been sick for a week and told my friend I had more mucus in my mouth then normal. She wants to be a doctor and told me it could be a sinus infection. And I’m a singer, it makes so much sense now why I need to clear my throat all the time. And I heard some of the infections are deadly 😥😥