Maybe he isn't giving it to you cause it's not effective in treating Bipolar (depression/mania)soley,and does little when combined with other meds.
Topamax has now become more popular for TMJ problems and migraines. Also it really doesn't do much for weight,and in some people,nothing.
I'd try the Lamictal, I too was afraid to when I started,but gradually increased over a few weeks,it is fine,you do not gain weight from it,nor are you left zombied out.
But then again,the old saying,"medications don't always work the same for everyone".
When I was on Topamax (I am mildly Bipolar-II) it did nothing,my pdoc,at first wasn't eager but let me give it a try. He claimed it wasn't working for many for what it was meant to do,people heard on the news that people were losing weight while on it which was over exaggerated,drawing many to wanting this "new" med.
Don't feel like you are missing out on anything if he doesn't give it to you,try other alternatives,the topamax,like I said is alright combined with something,but alone I do not picture it helping anyone with Bipolar (depression/mania) I wish you lots of luck and healing.
You'd probably be better off with the Lamictal