2 months since biopsy have Headache, dizziness, tachycardias, neck pain after cervical lymph node biopsy, could my carotid artery have been injured.

Not really. Anything is possible but the injury would be unlikely, it would have been readily apparent if it happened at the time of biopsy and your symptoms are not consistent with a carotid eatey injury so I would guess your carotid artery is fine. .