Sorry, I never had this problen, and I had three neck dissections. Everyone is different, but fluid can build up if it did not drain fully to begin with, after surgery from the drainage tubes in the neck, which is usually removed when the bulb only fills 1/3 or less. If fluid does buld up, it may need to be drained, like the doctor apparently did, but let he or she know of the continued problem. Inflammation from surgery, and lympatic fluid will build up due to the compromised lymph flow from the lymph nodes removed, but this should slowly subside in time, but maybe not completely like pr-surgery.

Do you sleep on an incline, I do, and that may help with drainage, and prevent pooling of fluids. Some do manual lymph drainage massage that can help, only by a trained therapist, since it has to be done in a certain direction,, motion, and pressure, but check with your surgeon since I don't know how far out from surgery you should be, and the same with accupuncture. My thought these days, is only my surgeon is touching my neck, so I never had any myself.

Good luck, and hope this helps.