Hi ~ This must be awful ~ I hate headaches, but mine are caused by my cervical spine. I have a herniation in there, so when I get one, I put my soft cervical collar on and it goes away. Is there any possibility that YOU could have a problem with the cervical spine?? You may need an MRI.
If you feel some pain in the back of the head, you could be using some ice on the back of your neck ~ that could help ease the headaches. I wouldn't use it any longer than 20 minutes ~ maybe less, and do it every 2 hours. See if that helps. Don't use HEAT.
Just a couple of suggestions. I hope you feel better soon. God bless & Take care. Hugs, Leesa