I only know from what MS patients say in group... that it is a nasty drug sometimes,but if it helps use it. I would wonder why you aren't on something that works specifically for panic attacks, rather than the heavy hitter of neurontin.
Have you tried the ssri's that help with depression and anxiety? IDK... if you have and they don't work, then I guess trying this is what you need to do.
I would question the doc about it though.
be well.