New symptoms of hypertension and tachycardia are most likely not related to your neck. Those symptoms can be related to pain but not to cord compression.
Did you inform the surgeon of numbness in the hands and legs as well as intermittent “heaviness or weakness of the legs”? These can be symptoms of myelopathy (see section on myelopathy on the website).
Another opinion by a good spine surgeon might be very helpful to you.