I am facing severe headache twice or thrice a week. Sometimes it started morning when waking and last for few hours. Or sometimes random time it starts and last for few hours. Initially it starts in both the forehead and back of head then after sometime the pains shifts to only one side(left) from  front to back and pain in shoulder too. And then the pain goes off. I am not to take pain killers and waits till the pain goes by itself. This is happening now frequently and worried if this could be serious issue.