Suboxone headaches and fluid in the head?

[Orchid_Suspiria]

Ever since swim started suboxone he quite frequently gets some pretty annoying and sometimes rather painful headaches.Swim read somewhere that this is because opiates increase a kind of fluid in the head and with suboxone there isn't as much euphoria to mask the headache.This is probably true because he has got these headaches but to a lesser degree with other opiates.Also sometimes in the morning he rubs his eyes and hears this sound like fluid popping.He thought it was sinuses at first but now he thinks it may be this.Whatever the cause is do any longtime suboxone users know how to minimize these headaches?They do have the potential to ruin swims day and any help would be appreciated.