Mine switch sometimes too - depending on if there's been a 'break' between cycles....
One time I'll get the 'customary' 45min jobby - the next it's the 4hr+ like this cycle
Like everyone has said - each of us suffer differently and meds that help some might not touch someone else.
Early on I tried Tegretol (made my CH far worse)‚ Trammadol (gave me urine retention - which was pretty epic
) Sodium Valporate just made me feel mental and also made my CH worse...Topamax was really quite good except for the fact that it retarded perspiration for me - which was a bit rough when I was doing heaps of sport at school so I had to go off it as my core temp was basically uncontrolled during exercise)I definitely was able to 'think' more easily on Topamax than on the current med.
But then I was also diagnosed with epilepsy - so currently on Lamictal (which up until last week was doing an awesome job of controlling both epi and CH - but now has decided to bail out on me! I was obviously just becoming way too complacent
)
I just wish they'd invent an Immi injection that we could have more than 2 of in 24hrs