Voice issue. Kindly advice if any.

My father suddenly yesterday got the voice issue .He is not able to speak at all . He has done root canal a week before and when he got this voice issue problem we went to doctor near by and they checked the blood pressure and found it's too high I.e., 200 ~100 And than we went for ECG in one hospital and that we found is normal.After that we went for a brain MRI scan and in the report it was mentioned at the last ~maxillary sinusitis . We got many medicines .He is not able to write as well now properly and not able to ear anything . Some body has suggested to go Sir Gangaram hospital for the diagnosis and to check with the neurosurgeon specialist,but we got the appointment day after tomorrow. Kindly advice if any.