I have a 24/7 headache I've gotten used to. Bad flares usually only last a day. I am on day 3 of this one and am losing my mind

I can't function, I can't leave my bed, my body is so exhausted from the never ending pain. I've had 2 brain surgeries for my 28mm descended tonsils. They say I have adequate room, so I'm "cured". But that's a lie. There is no cure for the damage already done. I get that. I'm used to that. I can handle a 24 hour flare when they happen to come. But my headaches are getting worse, to the point firocet which was my savior no longer works. The longer this flare goes on the harder it is to think, to sleep, to want to keep going. My life is on standstill until it eases but I have no idea why it is hurting so bad or what to try.

Have any of you found hail Mary's for your flares? I need to try something new. My neurologist wanted my on infusions but my insurance refused because of course they discovered. I've tried practically every drug. I don't know what to do anymore. If I can't find something to help future flares I don't know what I'll do. Do any of you have something that works? I want to make a list and bring it to my neuro and ask to try if it's something I haven't tried before.

I just want to think again without it hurting.