Waterbed Effect Still Present After Doc Tried to Aspirate Abdomen and Came out Dry. Should I Worry?

It sounds like you have an ongoing seroma problem. If you are asking should you be worried about this being dangerous, then the answer is no.  You can safely wait until your plastic surgeon returns.

Sometimes the layer of fluid is so thin that it is very difficult to aspirated and then it's better to just let it be rather than keep trying and increase the risk infection or injury to one of the surrounding structures.  

While you wait continue to wear your compression garment.

 

From your description it seems likely that there is more fluid or that some has accumulated under your abdominoplasty flap. This is one of the more common complications of a tummy tuck. It is common that patients who do develop a seroma will need more than one aspiration. I would contact your plastic surgeon and make another appointment to have him check you. In the mean time wearing an abdominal binder and taking it easy can help prevent reaccumulation of fluid as well. Best of luck, Dr Kerr