With your National Health Service, I understand the referral wait can be months. The good news is that there is no cord compression that you have reported- only nerve root compression. Nerves are more forgiving than the cord and the waiting time to see a surgeon can be longer. There still is some risk with waiting but the risk is much less than with cord compression.
Seizures would not be associated with nerve compression in the neck. Neck and shoulder pain more likely is related to this nerve compression. Many of the other symptoms are not related to the neck but could be related to anxiety. I am unclear what neck “graunching” is.