I have tight neck muscles, a pretty bad headache ( which I believe is a tension headache), and when my neck muscles get really tight my heart skips beats. Also, at times I feel lightheaded or dizzy. When I apply heat and get the muscles to relax all the symptoms go away and I feel ok. I've been drinking water and trying to get a good amount of electrolytes in my system. I'm 37, 5'6", and I don't drink or smoke (never have), and have never had any health issues.