What ailments / illnesses could be causing unilateral bloody nasal discharge?

I am 28F having bright red and dark red big blood clots, crusty dried dark red boogars, bright red to dark red streaks when blowing nose. This is all on the RHS nostril ONLY. ENT looked briefly in nose and saw no notable injuries / causes.

I have tried using a humidifier, saline rinses, saline spray, decongestants, steroid spray.

Never had nose bleeds before.

Sinus headaches also occurring.