I have an apcess on the right side top, & when i sniff i hear a sound like air escaping, or draining? and also feel it in my sinus...also a foul smell

Immediate attention: Seek professional help now . A root canal may be able to save the tooth. The worst case is the tooth cannot be restored and will heed to be extracted

See ENT: Sinus infections, or sinusitis, are one of the most commonly diseases. The microorganisms that cause the infection produce volatile by-toxins that contribute to the foul smell. Untreated sinus infections can damage the sinuses and lead to chronic sinusitis, ear infections and vision loss. Call ENT ASAP.