Hi. My father is 82 years old, and he has been in great health until recently. He has bladder cancer and is being treated for that with BCG flushes. Recently, he has been experiencing a lot of head pressure, and it seems relentless. He has been to his GP, and he says that he cannot find anything wrong. He has tennitis, and has had a past history of acoustic neuroma about 10 years ago. The pressure really bothers him. Is there anything to be concerned about with this condition?