Please I have bad small from my nose. Can you help...

Bad nose odor treatment
To treat bad nose odor, it is necessary to start diagnosing the health problem that may have stimulated the appearance of this smell and the cause is often sinus infections and it can be treated by taking antibiotics such as azithromycin 500 mg once a day for five days in addition to 10 antihistamine pills One capsule a day before bedtime, following the instructions below. Inhale water and salt, provided that a small amount is inhaled in one side of the nose first with the other side closed, then repeat the attempt with the second side and close the first side while drinking sufficient quantities of water and eating foods that need to be chewed. Which may stimulate the production of saliva in the mouth and daily brushing of the teeth
test or investigations
It is necessary to conduct a clinical examination of the patient so that the patient feels pain if the head is tilted down, and also a laboratory examination, such as a comprehensive blood test, so that we see an increase in white blood cells more than 12 thousand, and the number of neutrophil cells must be known to rule out allergies and viral and bacterial infections, and an X-ray must be performed To the head to prove the presence of the sinuses and the need for a quick and slow Corona test 
Possible causes
 Sinus infections
Corona infection
 tooth decay
 olfactory hallucinations
 adenoids
 Advice :
In the event of any emergency, we recommend visiting the nearest health center to conduct a medical examination and conduct the appropriate treatment, in addition to referring to a specialist