
Suggest Remedy For Sever Migraine

Subarachnoid hemorrhage, cause to be determined
Detailed Answer:
I read your query and I understand your concern.
From your description seems like the most probable diagnosis is a subarachnoid hemorrhage meaning a bleeding along the surface of the brain. It is life threatening and the cause has to be determined and prevented, because if it ruptures again it could be more serious.
Most of the times that happens in the setting of a malformation of a blood vessel in the brain the usual one is an aneurysm, a dilatation in the wall of the blood vessel. Rarely it's another type of malformation like a arterio-venous malformation or a dissection (a tear in the vessel wall).
To find out if that is the case exams like Angio MRI or Angiogram are needed, angiogram is the most sensitive exam.
If such an aneurysm is found surgery or endovascular intervention (entering through a catheter - like the angiogram) is needed to exclude that aneurysm so that it does not rupture again which could be life threatening.
Once that is done there is still the risk of some complications due to the blood already present, like spasms of the vessels due to irritation by blood causing ischemia, but since CT was negative at first it seems not much blood is present so that risk is smaller (but present) and the blood will be absorbed in the coming few weeks gradually.
It is a serious condition but from what you are describing your doctors seems to be taking all the right steps, making all the necessary exams and not leaving things to chance.
I remain at your disposal for further questions.

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