Left vocal cord paresis. Can speak well?

Hi Dotor, My left vocal cord was paralysed in march 2017 and since then I have lot of cough and sometimes maddening sensation at the left side of throat. I had a vagal schwanomma on my left side of neck and the tumor was removed sacrificing/cut the vagus nerve which resulted in vocol cord paresis. I cant speak at all when I move my head to the left side. Right side is bit normal which helps me to make people understand with very ĺess pitch(lots of energy is required to speak). What do you suggest, is there a way vagus nerve can be retained to help my vocal cord to move as before, so I can speak well? I am in a profile where my presence of voice is very much required. I will be very thankful if you could please show me the right path now to live my life normal, as I am unable to concentrate on anything since this all happened, its very frustating and depressing!