Thanks for your question on Healthcare Magic.
I can understand your concern.
By your history and description, possibility of
sinusitis related symptoms is more likely.
Lethargy, headache, excessive saliva, chest pressure etc are commonly seen with sinusitis.
So better to consult ENT doctor and get done clinical and endoscopic examination of sinuses.
Also get done x ray of
paranasal sinuses.
You will need higher antibiotic like
levofloxacin or
azithromycin.
Also do steam inhalation and warm water gargles 5-6 times a day.
Also take levocetrizine and
paracetamol combination twice daily.
Drink plenty of fluids orally and keep yourself hydrated.
Don't worry, you will be alright with all these.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.