See a chiropractor. If you don't believe in them, see a sports medicine doc. Nerve impingement/compression around C7/C8, which is the part of the spine around where the bump at the base of your neck is. Lots of things can cause it, it doesn't have to be something horrible to cause the symptoms you're describing, just a slight shift of pressure on the nerve root from muscle spasm/strain, bad mattress and/or crappy pillow can cause numbness and tingling. A shifted vertebra can cause it too, which is what a chiropractor can shift back.