Yes, taste & smell can be lost due to sinusitis but to be sure about your condition CT PNS is required.
You can take:
Tab. Augmentin duo 625mg TDS
Tab. Neksium 40mg OD
Tab. Naprosyn 500mg SOS for headache
Tab. Allegra 180mg HS
Flomist Nasal spray 1 puff BD
Steam inhalation TDS
Continue this treatment for 1 week.
Next Steps
Consider online consultation for detailed history and treatment