thanks for your question.
this is likely your cold related.
there are lymph node deep seated in the tissue, which may not be felt well from outside.
the muscle spasm is another possible cause since you have difficulty moving your neck other side.
Ibuprofen is helpful due to its anti inflammatory action.
this should improve over next few days.
I just wanted to make sure this was not heart related but I am not having chest pains or anything like this.
no this is not heart related.
please do not worry
Thank you. I can sleep well tonight.