Welcome in H.C.M.
I have gone through your query regarding recurrent headache, feverish, pain in neck, sore throat
From your symptoms it is clear that your previous infection was not cred and same had reactivated.
You are now advice to consult your ENT doctor for your thorough examination and necessary investigations to plan for treatment.
Till you are in waiting you may take-
(c) Steam inhalation.
(d) Warm saline gargling.
Hope this will help you.