Hi,
Noted your history about professional singing, losing voice on high pitch after a busy schedule it seems.
Since you are a professional singer your vocal cords are well trained for all pitches.
Losing the voice at a typical range indicates a problem with the vocal cord which may be edema, small ''singer's nodule'', or so.
I would advice you the following:
Consult an ENT Surgeon and get the
laryngoscopy done to know the exact problem.
I am afraid, you may need a voice rest for a week or so.
Additional anti-inflammatory medicines like
Serratiopeptidase, oral
steroids may be required.
Voice rest is most important.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, ENT & General Surgeon