Stress causing tension in my head/scalp

I subconsciously squint my eyes throughout the day & it causes me to tense my head/scalp. I can’t feel it until the very end of the day when I lay down to go to sleep. When I start relaxing in bed I can feel my head/scalp relax & suddenly the blood built up from the tension rushes back to down normal levels. I can hear the blood rush & it feels almost like having blood drawn with a tourniquet. It causes sudden, extremely painful, short lived headache flashes (1-3 seconds at most.) Anyone else experience this? Any tips/tricks to help?