Diagnostic Nerve Block in Cervical Spine?

Throwing it out there ... has anyone ever had a diagnostic nerve block in the neck? Prior to being diagnosed - they injected my neck then afterwards I was dizzy for 2.5 hours after. I was so dizzy I couldn't stand on my own. Does anyone know what caused the dizziness? They injected nerves in the neck. Can the dizziness be cause because it was so close to the spinal cord or due to CM??? Any thoughts would be greatly appreciated.

Thank you!

I recently had this. C3-C7. They did it in two sessions... were u awake for it or did they sedare you? I was awake and it was terrible. I didnt get dizzy tho but dizziness was probably due to location and trauma.