Severe headache when I put my head down.

Recently I've started experiencing shooting pains in the back of my head which extend to my temples and the eyes...behind the eyes. Sometimes it feels like throbbing. I already have episodes of migraine but this seems different. It starts when I lay down or put my head on a pillow. I've tried changing pillows, used cervical, orthopedic pillows, tried laying down sideways but once the pain starts, it doesn't go away and the rest of my day is ruined. I have no choice except popping in painkillers. Sleeping is difficult. I don't get much relaxed sleep. I work as a virtual IELTS trainer so a lot my time is spent in front of the screen. I generally have a good posture and while I'm conducting my sessions fatigue is there but not the pain. Pain starts as soon I lay down. I need to rest and that seems to have become a curse for me. I desperately need help. Please advise. I'll follow up with you diligently. Thank you.