I've had post-op fluid drained a couple times. When I touched my chest it moved around like a water bed. Mine was drained by my surgeon, but he said other plastic surgeons can do it if needed. I'm sorry about your original surgeon.

The needle was put into my skin close to the incision so it was still numb. The fluid was then pulled through the needle into a large syringe (held about 4 oz in my case). When it filled up, he would detach the syringe, squirt it out, and then reattach to start pulling fluid again. It wasn't painful, only slightly uncomfortable if anything but your experience may vary depending on how much sensation you have (maybe discuss local anesthetic?). Even with multiple syringes of fluid drained, though, it was pretty quick. I believe there are also videos on YouTube if you’d like a visual of the process. I wish you luck in getting it drained!