I'll chip in and say that fumigation also is the only thing that worked for us also. You only have to be out of the house for a few hours, and the problem will be solved. Definitely try getting some bug bombs!

Also, as an addition to what Patrick said, we just put all our kitchenware (pots, plates, flatware, food, etc...) into plastic trash bags and sealed them off with tape. That worked well for us since our kitchen was open to the rest of the house and couldn't be sealed off.