It's been months and nothing's changed, thinking of going off (50mg)

ive been on 50mg pristiq for about 4 months, perscribed for anxiety, mild depression and chronic headaches. i dont think ive noticed an improvement in any of these things, maybe a bit for anxiety but not much. i dont want to be on something thats not helping me so im thinking of going down to 25mg and then stopping but im not sure exactly how to go about this or if i should wait longer.

also, my follow-up with the neurologist who prescribed it to me is in a few weeks from now, so maybe i should just wait until then but i would appreciate any thoughts or anecdotes. thanks