Persistent throat burning and hoarseness

Hello doctors, I’m an 19-year-old female classical vocalist. A month ago, after stopping Dydrogest early (Day 19), I experienced hormonal disturbance, delayed periods, mood swings, and sudden voice hoarseness. Took a Gateway softgel and a Vit D supplement; periods started next day. I oversang for my music exam(5hr/day) for 5 days. Sang with a croaky voice, couldn’t reach high notes. ENT prescribed Flamheal Forte( 3 pills within 24 hrs due to exam urgency)— helped ~40%. 2 days later, burning throat started (after spicy food). had complete voice rest for a week. On light singing, burning returns briefly. No pain, only occasional burning while singing/speaking/swallowing. My voice is now clear & normal. Recently prescribed Ulgel-A.  hoarse voice lasted 1 week. burning throat-11days and going on. Queries: 1. How long will this last? 2. Is it vocal cord damage or reflux irritation? 3. Is it permanent? 4. When can I sing again? 5. Is laryngoscopy needed?                      Thank you.