Mon, DW had levels of 18000 or thereabouts (I ended up asking recently as we didn't actually know the number) and she was bloated like a hot air balloon. She just pumped 3L of water through a day (no energy drinks or anything like that) and followed all the advice of the clinic and managed to stay out of trouble. It did take some time for her to deflate though.

They keep telling her the only reason she avoided serious OHSS is because she religiously stuck to the water.