Thanks for writing your query.
Increasing the dose of antibiotic will not cure the infection completely, unless the antibiotic is sensitive to the infecting organism.
You should get a culture/senstivity test for the nasal discharge to know the causative organism and the appropiate antibiotic for the infection.
Avoid using any medicine which has not suited you in past and has caused any hypersenstivity reaction.
You can do steam inhalation for relief from inflammation in your sinus
along with taking anti-inflammatory medicines like ibuprofen
one tablet twice a day after meals and antihistaminic like fenofexadine
120 mg once a day and decongestants like phenylepherine.
If your problem persists, get yourself examined by an ENT specialist
I hope this is helpful to you.