Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that you have infection in the sinuses leading to Sinusitis and it has been due to close proximity of the sinus floor to the roots of the upper molars and at times the roots can lie within the sinus..
It can cause infection in sinuses secondary to infection in tooth..
Clindamycin will help in reducing infection but you need a proper management of Sinusitis and also consult an Endodontist and get a proper
Root Canal treatment done..
I would suggest you to consult an Otolaryngologist and get evaluated and a thorough clinical evaluation and investigations like PNS view x ray or MRI scan can help in diagnosis and treatment can be done accordingly..
You can be advised a course of antibiotics, anti-inflammatory painkiller like Ibuprofen, decongestants like Pseudoephadrine, do saline
nasal irrigation, steam inhalation and use a humidifier in your room..
You can also be advised decongestant nasal sprays containing
Xylometazoline or
Oxymetazoline..
Avoid spicy and chilled foods..
Do warm compresses around nostrils..
Hope this helps..
Regards..