The symptoms as mentioned in your post indicate that your sinusitis
has not subsided completely due to inadequate treatment.
Symptomatic relief can be obtained by intake of analgesic
, antihistamines & nasal decongestants.
But unless the underlying cause is treated, the symptoms will keep recurring.
So, you need to take antibiotics depending upon culture & sensitivity reports to tackle the organism responsible for it.
Kindly consult an ENT specialist
for a proper clinical examination.
Investigations like complete blood count
& X ray of para-nasal sinus will be helpful.
There is no need to worry...you will be fine.
Wishing you a good health.
Thanks & take care.