Have you tried NAC for the cough? Helps some people.To grab the correct spelling, I performed a quick internet serach and pulled this link. Not an endorsement of the article. :D
Top 9 Benefits of NAC (N-Acetyl Cysteine) - Healthline
I am attacking Long Haul Wuhan Virus. I am going on guanfacine at bedtime and N-Acetyl Cysteine. The Guanfacine id an old drug the 60’s to treat hyperactive children. See if your doctor will prescribe it for you.