I have a low grade fever am very fatigued my eyes are draining a thick sticky fluid and my muscles ache I feel bad and just want to sleep what could be wrong?

No one here can diagnose a medical problem without a physical exam and testing.

I am not a doctor, so I will not guess. Please see a doctor. I do hope it's nothing very serious.

We don't even know what part of the world you live in, how old you are, what gender, what your diet is, your health history... see a doctor. Meanwhile, drink more water. Any secretion that is thick is a sign that you might be dehydrated.
A tropical parasite would be pretty silly in Denmark. And so on.

Anything from a infection, to cold, to serious medical illness. No way to tell without proper testing