Mel, I get them rarely (thank goodness). I don't have Rx meds for them, so I have to try and nip them in the bud as best I can.

I take 800 mg of ibuprofen and put an ice pack on the back of my neck (or whatever frozen veggies are in the fridge) ASAP. Another thing I've tried is alternating hot and cold application on my neck. Messy, but it works best - stick your head under the bathtub faucet and alternate the hottest water you can stand with the coldest water. Tiger Balm rubbted on my neck and temples helps too.

I try laying down in a dark room, but for some reason staying still seems to accentuate the pain for me.