Brain fog

I took 0.25 Xanax for 5 months, went cold turkey because my doctor told me I could do it, but I felt very sick, lethargic, bad headache, nausea, balance completely off, dizzy, vision issues and with brain fog. Every stimulation got me headache, now I’m almost at the end of my 3 months taper, things are better but brain fog is still severe, when I try to engage in mental stimulation I get so tired and foggy like when you have the flu. Is there something I could do or take? How long did it take for you guys to be able to focus on things and feel clear headed?