Doubt plz clear. Only on nose part.

My age is 31 female. On 15th I had a symptoms of covid. Then I checked rtpcr test on 18th. Result came on 20th it's positive.. after that Im taking tablets Doxycycline, paracetamol, pantoprozole 40mg, tap- methylprednisolone 8mg, cap becosules zinc. Before taking rtpcr test I had doxycycline, flucold and wysolone 10mg for one night. Now from yesterday I had very heavy feeling on inside nose. Because of this heaviness on nose I can't do anything.. when I'm looking down or turning talking whatever I feel very heavy only on nose part.. because of that I feel my whole head is very heavy.. I inhale the tomato plants two times because I loss the smell.. Soo for smell I inhaled that plant. I'm fearing about black fungus. Please explain me in detail. Because of this I can't be normal. Searching all symptoms and not getting clear. Plz plz help me. I'm very sacred. Doctor asked to take fluka 150mg for 3days morning and night. I'm very very scared about black fungus..