Hi Graham,
Sorry to hear that both you and your son also suffer from the same problem.
My thinking is that whatever is attacking our bodies causing M.E., has the strongest effect in the weakest part of our body. Like I mentioned earlier, I suffered from sinus problems since a child. After my operation for deviated septum, it got better but, I would still get some sinus infections. Since I got hit with M.E, it has become a chronic, increasingly severe problem. I may be wrong but, I don't think that my chronic sinusitis is the cause of my fatigue. I think that since contracting M.E., my sinus problem has become much worse and chronic. Besides dairy, I know that my sinuses get worse from seasonal allergies - pollen. In addition, when it's a windy day, the pain goes through the roof! I don't know if it's because of the change in the barimetric pressure or because the pollen gets thrown all over the place. What is so strange to me is that even though I'm in bed in my bedroom with all windows closed, the ac blowing and I have an air filter on constantly, if it's a windy day, I am going to be very sick without fail. It's like win is my biggest enemy.
I think that others who have suffered from asthma since childhood and now they have M.E., I think that their lungs will be adversly effected because that is the weakness in their body.
I have been on constant antihistamines for years and years. I'm sure that's doing wonders for my body! I can't live without it though.
I ordered the irrigation system that ukxmrv suggested and hope that will help. In addition, this new Kinesiologist that I go to gave me drops to put in some water and wash out my nose with it. I'll see if that will help. Hot steaming is alway soothing but temporary.