I have a headache, insomnia, sore throat, hard time breathing through nose, weakness, tired and cough. i have antibiotics but dont want to take them if it is just a viral infection. should i take antibiotic or just treat this with rest and fluid?

You are right: you don't want to take an antibiotic unnecessarily, unless directed by your doctor, all what you have can just be a viral infection. Rest, pain killers, antihistamines, saline nasal washes, salt water gargles, more fluids and rest would be the way to go, if no improvement or worsening symptoms, see your doctor, but still don't start antibiotics on your own, wish you well