Mucormycosis is a fungal infection of the sinuses, eye and the brain. The term Black Fungus used for Mucormycosis is a misnomer. 

Patients with mucormycosis can present with one of the following symptoms
Nasal stuffiness and sinusitis
Pain over the sinuses
Decreased vision or loss of vision
Drooping of the upper eyelid (ptosis)
Swelling over the eyelids
Black lesion in the mouth or the nose

Your Eye and ENT doctors will examine you and ask for MRI scans if you are suspected to have the mucormycosis infection. Based on the scans they will let you know what treatment may be required 

In most of the cases you may need to stay in hospital of care for 7-8 days 

It is important to check if the patient is fit for surgery which requires testing that may take 1 to 2 days. Based on fitness for surgery the sinus infection is cleared and a decision for the eye infection taken.