I'm sorry your mom is going through this.
Was her bp increase a pain response when it went that high - has it come down since? - or has it remained that high?
Migraine can start suddenly in the elderly - https://www.webmd.com/migraines-headaches/geriatric-headaches#1 It may be a result of her stroke, or perhaps she has had some TIAs - her neurologist may be able to answer that question.
There are treatments that are safe for the elderly that may help reduce the frequency and/or severity, even if you can't figure out a cause. I hope she finds some relief.
Ask her doctor if she can take Amitriptyline (Elavil) daily for pain management. I've been on it for about 11 years, and it has helped SO much! My grandmother was on it for her Restless Leg syndrome pains before she passed.
does anyone no what pannick attacks are because I have convinced my self that I must have a brain tumer or some type of cancer in my body because io keep getting pannick attacks to the stage im having like 3 pannick attacks a day because im thinking that I am dying doctors have said that I haven't got one but how would they no that if they haven't sent me for a ct scan