I feel sick but I have no usual symptoms?

For the past few days I've been feeling like I am about to get the flu. I can smell my sinuses producing something but there is no mucus. i have no headache, fever, cough, sneezes, sniffles, stuffy nose, sore throat. nothing. I've just been feeling mildly weak, and very hungry. I have also lost my sense of smell. all i smell is whatever my sinuses are doing, and i always smell that when im sick.I also feel stagnant, like i want to do things, but i dont want to move and i dont care about the consequences of staying put, such as missing class or missing hanging out with my lady friend.

whatever mucus my sinuses are producing it is very pale and gooey. it is not much though. the smell i smell is kinda burning with a hint of musk or sweetnsalty. hard to explain, but it smells like something is brewing.

this has never happened to me before, what is going on? am I about to get very sick, or is it a mild sickness?