I HAVE HAD SURGERY ON THE MIDDLE BACK OF MY HEAD FOR A CYST (3 TIMES). 1ST TIME LASTED 8 YRS, 2ND TIME 2 YRS, 3RD AND PRESENT 2YRS, BUT NOW I CAN HEAR IT BUILDING AGAIN. IF I SLEEP WITH MY HEAD LEANING BACK, I BELEIVE MY NECK FILLS WITH FLUID. WHEN I AM WAKING UP I CAN HEAR THAT FLUID MOVE UP TO THE SPOT IN THE BACK OF MY HEAD. SOUNDS LIKE FLUID BEING SHOT FROM A WATER PISTOL. SO FAR THE DOCTORS THINK IM CRAZY, BUT BEFORE LONG I WILL NEED SURGERY AGAIN, BECAUSE OF THE PAIN AFTER IT BUILDS UP.
HIT hank for asking to ChatDoctorI really understand your concern, this could be hallucination effects because of your extremely reactive and apprehensive behavior you have to take it easy, first thing I would like to say you that any kind of fluid accumulation in brain first manifest the clinical symptoms and that could be medical emergency but nothing such thing happened to you so why to worry still if you have strong doubt then better go for MRI test this will clear your doubt, have nice time