If you have time to buff up before combat, you could buy 2-4 scrolls of antimagic field (you have to buy more than one scroll in case you roll a natural 1 on the UMD check to activate the first).
Since the UMD DC to activate the scroll is 31, you will probably need skill focus (UMD) and perhaps magical knack too, i'm quite sure they stack.
If you succeed you will have lost most of your alchemist abilities, but on the other hand the wizard won't be able to cast any spells at you either thus rendering most of his spells useless.
