What do you suggest if i'm laying down and i lift up my neck and as i do that i feel a sharp pain on my knee?

Pinched Nerve: Sounds like a pinched nerve in your neck. Typically that is most times what causes pain all the way down or up your arm. Alternatively, it could be a pinched nerve in arm as well like in the brachial plexus and/or nerve entrapment elsewhere. If your knee hurts it suggests the pinching in your neck is more severe than usual. I would suggest seeing a spine specialist to evaluate this further.