Left side neck pain, left neck muscles extremely tight, pain/twitching/weakness/shakiness in left arm. a very sore spot around c5/c6. 34 female. tips?

You may have a: pinched nerve in the neck.The weakness is concerning and requires a work up.See a Neurologist or start with your family doc.The twitching goes along with weakness when the nerves to a muscle are compromised( fasciculations).This requires prompt attention and could be from a herniated disc in the neck or another process that has compromised the nerves.Good luck