Is sphenoid sinus infection dangerous should i be very worried it?

Depends: It depends what is causing it. Viral infections are fairly common and mild, requiring only supportive care. A bacterial infection, you may need to take antibiotics for to clear and prevent from spreading. A fungal infection, like mucormycosis, is life threatening and needs surgery immediately.

It can be dangerous: Would see a physician asap. Appropriate antibiotic therapy should be initiated.