Hi. It is possible that the sore throat from your sinus headache has created some vocal cord irritation and perhaps some oedema. That can explain the raspy-ish voice. It can also be possible that since you are an actor and would have had to speak a lot, that there would be some vocal cord irritation and edema due to voice overuse as well. Sudden bout of cough during your illness must have done the same too. In either case the best way to get you close to your normal voice is by maintaining absolute voice rest for as long as you can before your video audition. Voice rest reduces vocal cord movements and allows healing. When you speak the cords vibrate and the swelling persists. If you have cough then use antitussive lozenges to reduce it as much as possible. If it is possible for you to rest your voice for upto 24 hours (ideally 48) then that will help the vocal cords heal remarkably. If you do need to speak then use short sentences and speak in a normal tone. Do not whisper as it creates more damage to your vocal cords. In addition take sips of normal or lukewarm water every 30 minutes to keep your throat moist and well hydrated. Avoid gurgling as it precipitates a lot of movement in your throat. Adding a good antacid (Cap Pantoprazole 40 mg once in the morning 15 minutes before meals) and an anti inflammatory + anti edema tablet (paracetamol/diclofenac + serratiopeptidase) can help speed your recovery. If your voice does not return to normal or improve significantly after 24 hours of absolute voice rest then you will need to visit an ENT specialist for a laryngeal endoscopy to rule out an early nodule or a hematoma on your vocal cords. The improvement will also be minimal if you do not honestly rest your voice and put up efforts half heartedly. Do keep me posted on your recovery. Treatment is an iterative process so do give me the chance to make modifications to the management if your recovery is tardy. This can help me tailor the treatment best needed for you.