I've been saying I'm under tall all of my life! Nice to hear it from someone else.
Have you tried one of those microwave rice bags for your neck?
Another idea my doctor told me to try-- roll up a hand towel real tight. Now lay down on the floor and place the towel under your neck and move your body away from the towel just a wee bit so that your head is stretch a little from your body. Lay that way for about 5 minutes. Repeat a few times a day. I've tried it and it works for me. Hope yours feels better soon.