Here you have given symptoms like
constant headache, soreness at base of skull, confusion all the time, chronic joint pain,
night chills with fever, sore eye.
As well you have also told that you have left
smoking from past 6 months. If your symptoms started after leaving the smoking then some of this could be related with that.
But chronic joint pain and fever in night with chills again can be with other causes too. I suggest to visit your doctor and do
blood test for diagnosis of which type fever it is. It can be
malaria or dengue also. And since you have complain of chronic joint pain it could be chicken gunia too. I suggest do not wait further and get your self diagnose properly and take treatment as per the need. Here you have told all this symptoms are from past 3 weeks and its enough time you have waited.
Till the time you do all the reports and start with proper treatment, discuss with your doctor and start with symptomatic treatment along with antibiotic.
I am sure you will be fine if you take treatment as per diagnosis rather then symptoms. Take care.