Thanks for writing your query.
You should try to avoid the allergen triggering your attack of sinusitis
Steam inhalation 2-3 times a day will be beneficial in decreasing your symptoms.
You can take antihistaminic like Fenofexadine
120 mg once a day along with decongestant like phenylepherine. Pain killer like Ibuprofen one tablet twice a day after meals along with an antacid like Omeprazole
20 mg will help in relief from pain.
Any medicine should be taken only after discussing with your ENT specialist
I hope this is helpful to you.