Hey hopeless -
Lyme and a stiff neck definitely can go together. BUT. The their is a cold/flu/bug going around right now that is causing some to have a stiff neck. Three weeks ago, I definitely had a daily stiff "couldn't turn my neck it was so stiff" as a random symptom with my cold; my kids did, too. And, I was chatting with a check out clerk the other day and she said, without prompting, that her cold was giving her a stiff neck, too.
Just wanted to give you a heads up that this might not be lyme to blame this time